Subsequent Events [Abstract] Subsequent Event Subsequent Events [Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Term Loan Senior Notes [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 2021 Term Loan Term Loan Facility [Member] Term Loan Facility [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Total debt Long-term Debt Current portion of long-term debt Long-term Debt, Current Maturities Long-term debt Long-term Debt, Excluding Current Maturities Deferred financing costs Debt Instrument, Unamortized Discount Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net Accounts Receivable, Net, Current Inventories Inventory, Net Other current assets Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Equity investment in affiliate Equity Method Investments Deferred tax assets Deferred Income Tax Assets, Net Other assets Other Assets, Noncurrent Total assets Assets Liabilities and Stockholders' Deficit Liabilities and Equity [Abstract] Current liabilities Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Warranty Product Warranty Accrual, Current Accrued expenses Accrued Liabilities, Excluding Product Warranty Accrual Current Accrued Liabilities, Excluding Product Warranty Accrual Current Deferred warranty income Deferred Revenue, Current Other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Long-term liabilities Liabilities, Noncurrent [Abstract] Warranty Product Warranty Accrual, Noncurrent Deferred warranty income Deferred Revenue, Noncurrent Other liabilities Other Liabilities, Noncurrent Pension Liability, Defined Benefit Plan, Noncurrent Total long-term liabilities Liabilities, Noncurrent Guarantees, commitments and contingencies (Note 6) Commitments and Contingencies Stockholders' deficit Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.0001 par value, 10,000,000 shares authorized, 400,000 issued with liquidation preference of $40,000 at March 31, 2018 and September 30, 2017 Preferred Stock, Value, Outstanding Common stock, $0.0001 par value, 100,000,000 shares authorized, 23,912,188 and 23,739,344 issued and outstanding at March 31, 2018 and September 30, 2017, respectively Common Stock, Value, Outstanding Additional paid-in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders' deficit Stockholders' Equity Attributable to Parent Total liabilities and stockholders' deficit Liabilities and Equity Condensed Financial Information [Abstract] Condensed Financial Information [Abstract] Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Balance at beginning of period Standard Product Warranty Accrual Add current period accruals Standard Product Warranty Accrual, Increase for Warranties Issued Current period reductions of accrual Standard Product Warranty Accrual, Period Increase (Decrease) Balance at end of period Organization, Consolidation and Presentation of Financial Statements [Abstract] Nature of Business and Basis of Presentation Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Segment Reconciling Items Segment Reconciling Items [Member] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment gross profit Gross Profit Selling, general and administrative expenses Selling, General and Administrative Expense Interest expense Interest Expense Interest income Investment Income, Interest Other income (expense), net Other Nonoperating Income (Expense) Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt Income (loss) before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Statement of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Net Income (Loss) Attributable to Parent Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Amortization of debt costs Amortization of Debt Issuance Costs Share-based compensation Share-based Compensation Equity in net income of affiliate Income (Loss) from Equity Method Investments Loss (gain) on disposal of fixed assets Gain (Loss) on Disposition of Assets Deferred taxes Deferred Income Tax Expense (Benefit) Amortization of deferred actuarial pension losses Defined Benefit Plan, Amortization of Deferred Gains (Losses) Defined Benefit Plan, Amortization of Deferred Gains (Losses) Loss on debt extinguishment Unrealized gains on foreign currency hedges Foreign Currency Transaction Gain (Loss), Unrealized Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses, pension and other liabilities Increase (Decrease) in Accrued Liabilities Total adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Total cash used in operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash paid for fixed assets Payments to Acquire Productive Assets Proceeds from sale of fixed assets Proceeds from Sale of Productive Assets Total cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Repayments under the former senior term loan Repayments of Senior Debt Borrowings under the new term loan Proceeds from Issuance of Senior Long-term Debt Repayments under the new term loan Repayments of Medium-term Notes Cash paid for capital leases Repayments of Long-term Capital Lease Obligations Cash paid for debt issuance costs Payments of Debt Issuance Costs Cash paid to extinguish debt Payment for Debt Extinguishment or Debt Prepayment Cost Payment of dividends on preferred stock Payments of Dividends Cash paid for employee taxes on vested restricted shares and stock option exercises Payments Related to Tax Withholding for Share-based Compensation Proceeds from exercises of warrants Proceeds from Warrant Exercises Common stock repurchases under the share repurchase program Payments for Repurchase of Common Stock Total cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Interest paid, net of interest received Interest Paid, Net Income tax paid, net of tax refunds Income Taxes Paid, Net Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Change in accounts payable for capital additions to property, plant and equipment Increase (Decrease) Capital Expenditures Incurred but Not Yet Paid Increase (Decrease) Capital Expenditures Incurred but Not Yet Paid Cashless exercise of stock options Proceeds from Stock Options Exercised Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Options Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Expected Volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Dividend Yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Risk-Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected Term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Weighted-average grant date fair value of an option award granted in period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Inventory Schedule of Inventory, Current [Table Text Block] Product Warranties Schedule of Product Warranty Liability [Table Text Block] Self-Insurance Schedule of Self Insurance Reserve [Table Text Block] Schedule of Self Insurance Reserve [Table Text Block] Pension Expense Schedule of Defined Benefit Plans Disclosures [Table Text Block] Supplemental Financial Information Additional Financial Information Disclosure [Text Block] Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Amortization of prior loss Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Amortization of prior loss, recognized in other comprehensive income Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Total recognized in net periodic pension benefit cost and other comprehensive income Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax Equity [Abstract] Accumulated Other Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Subsequent Event [Table] Subsequent Event [Table] Stock Conversion Description [Axis] Stock Conversion Description [Axis] Conversion of Stock, Name [Domain] Conversion of Stock, Name [Domain] Series A Preferred Stock Converted to Common Stock Series A Preferred Stock Converted to Common Stock [Member] Series A Preferred Stock Converted to Common Stock [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series A Preferred Stock Series A Preferred Stock [Member] Common Stock Common Stock [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Dividend rate Preferred Stock, Dividend Rate, Percentage Common Stock, Par Value (in dollars per share) Common Stock, Par or Stated Value Per Share Beneficial ownership limitation in excess of Beneficial Ownership Limitation In Excess of Common Stock Beneficial Ownership Limitation In Excess of Common Stock Shares converted Conversion of Stock, Shares Converted Shares issued upon conversion Convertible Preferred Stock, Shares Issued upon Conversion Shares, conversion rate Convertible Preferred Stock Shares, Conversion Rate Convertible Preferred Stock Shares, Conversion Rate Shares outstanding Preferred Stock, Shares Outstanding Preferred Stock, Par Value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock, Liquidation Preference, Value Preferred Stock, Liquidation Preference, Value Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares Issued Common Stock, Shares, Issued Common Stock, Shares Outstanding Common Stock, Shares, Outstanding Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Letters of Credit Letter of Credit [Member] Credit Facility Line of Credit [Member] Senior Credit Facility Senior Credit Facility [Member] Senior Credit Facility [Member] Senior Revolving Credit Facility Senior Revolving Credit Facility [Member] Senior Revolving Credit Facility [Member] Long-term line of credit Long-term Line of Credit Stated interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Weighted average effective interest rate (as a percent) Long-term Debt, Weighted Average Interest Rate, at Point in Time Letters of credit, amount outstanding Letters of Credit Outstanding, Amount Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Interest expense Interest Expense, Debt Income Statement [Abstract] Net sales Revenues Cost of goods sold Cost of Revenue Gross profit Operating expenses Operating Expenses [Abstract] Selling, general and administrative expenses Operating profit (loss) Operating Income (Loss) Loss on debt extinguishment Income tax (expense) benefit Income Tax Expense (Benefit) Equity in net income of non-consolidated affiliate Net income (loss) Earnings per share: Earnings Per Share, Basic and Diluted [Abstract] Net income (loss) (from above) Less: preferred stock dividends Preferred Stock Dividends, Income Statement Impact Net income (loss) available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Basic weighted average shares outstanding Weighted Average Number of Shares Outstanding, Basic Diluted weighted average shares outstanding Weighted Average Number of Shares Outstanding, Diluted Basic earnings (loss) per share (in dollars per share) Earnings Per Share, Basic Diluted earnings (loss) per share (in dollars per share) Earnings Per Share, Diluted Raw materials Inventory, Raw Materials, Net of Reserves Work in process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Total inventory Long-term Debt, Fiscal Year Maturity Long-term Debt, Fiscal Year Maturity [Abstract] 2018 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2019 Long-term Debt, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt, Maturities, Repayments of Principal in Year Five Total debt Long-term Debt, Gross Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States UNITED STATES Canada CANADA Rest of world Rest of World [Member] Rest of World [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Bus Bus [Member] Bus [Member] Parts Parts [Member] Parts [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of Operating Segments Number of Operating Segments Gross profit Commitments and Contingencies Disclosure [Abstract] Guarantees, Commitments and Contingencies Commitments Contingencies and Guarantees [Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Earnings Per Share [Abstract] Anti-dilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Restricted Stock Restricted Stock [Member] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Net income Less: convertible preferred stock dividends Weighted average common shares outstanding (in shares) Basic earnings per share (in dollars per share) Weighted average dilutive securities, convertible preferred stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Weighted average dilutive securities, share-based compensation (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted average dilutive securities, warrants (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Weighted average shares and dilutive potential common shares Diluted earnings per share (in dollars per share) Accounting Policies [Abstract] Summary of Significant Accounting Policies and Recently Issued Accounting Standards Significant Accounting Policies [Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Reconciliation of Operating Profit (Loss) from Segments to Consolidated Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates and Assumptions Use of Estimates, Policy [Policy Text Block] Recently Issued Accounting Standards and Recently Adopted Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Debt Debt Disclosure [Text Block] Product Warranty Liability [Table] Product Warranty Liability [Table] Product Warranty Liability [Line Items] Product Warranty Liability [Line Items] Standard product warranty, period Standard Product Warranty, Period Standard Product Warranty, Period Extended product warranty, period Extended Product Warranty, Period Extended Product Warranty, Period Shipping and handling revenues Shipping and Handling Revenue Shipping and handling cost of goods sold Shipping, Handling and Transportation Costs Warrants outstanding (in shares) Class of Warrant or Right, Outstanding Common stock shares that may be called by warrants (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Earnings Per Share Earnings Per Share [Text Block] Statement of Comprehensive Income [Abstract] Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Net change in defined benefit pension plan Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Net unrealized (loss) gain on cash flow hedges Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Total other comprehensive income Other Comprehensive Income (Loss), Net of Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Restricted Stock and Restricted Stock Units (RSUs) Restricted Stock and Restricted Stock Units (RSUs) [Member] Restricted Stock and Restricted Stock Units (RSUs) [Member] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Balance, beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited/canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Balance, end of period (in shares) Weighted-Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Balance, beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited/canceled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Balance, end of period (in dollars per share) Share-based compensation Allocated Share-based Compensation Expense Excess tax benefit Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Period for recognition of unrecognized compensation costs Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Movement in Extended Product Warranty Accrual [Roll Forward] Movement in Extended Product Warranty Accrual [Roll Forward] Balance at beginning of period Deferred Revenue Add current period deferred income Deferred Revenue, Additions Current period recognition of income Deferred Revenue, Revenue Recognized Balance at end of period Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding options, beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Outstanding options, end of period (in shares) Fully vested and exercisable options, end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Weighted Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding options, beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Outstanding options, end of period (in dollars per share) Fully vested and exercisable options, end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Outstanding options, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Fully vested and exercisable options, end of period, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Fully vested and exercisable options, end of period, Weighted Average Contractual Remaining Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Total AOCI AOCI Attributable to Parent [Member] Defined Benefit Pension Plan Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Cash Flow Hedges (Effective Portion) Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Balance, beginning of period Other comprehensive income (loss), gross Other Comprehensive Income (Loss), before Reclassifications, before Tax Amounts reclassified from other comprehensive income and included in earnings Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Total other comprehensive income (loss), before taxes Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Income tax (expense) benefit Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Balance, end of period Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Effective tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Statutory Federal income tax rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Period expense for newly enacted US tax reform Tax Cuts and Jobs Acts of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) Tax Cuts and Jobs Acts of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) Increase in uncertain tax position Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Unrecognized Tax Benefit, Provisional Income Tax (Expense) Benefit Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Unrecognized Tax Benefit, Provisional Income Tax (Expense) Benefit Additional valuation allowance Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Assets, Increase (Decrease) in Valuation Allowance Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Assets, Increase (Decrease) in Valuation Allowance Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Current portion Self Insurance Reserve, Current Long-term portion Self Insurance Reserve, Noncurrent Total accrued self-insurance Self Insurance Reserve Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]