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Consolidation and Presentation of Financial Statements [Abstract] Trade accounts payable and other accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Total noncurrent portion of term loan Loans Payable, Noncurrent Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Capital Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Airline Services Airline Services [Member] Airline Services [Member] Borrowings from credit facility Proceeds from Issuance of Long-term Debt Fiscal 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Contract with Customer, Asset and Liability Contract with Customer, Asset and Liability [Table Text Block] Income tax benefit related to deduction for energy efficiency Effective Income Tax Reconciliation, Deduction Energy Efficiency, Amount Effective Income Tax Reconciliation, Deduction Energy Efficiency, Amount Social security tax, employer, deferral, CARES Act Social Security Tax, Employer, Deferral, CARES Act Social Security Tax, Employer, Deferral, CARES Act Trade accounts receivable, net of allowances of $36.0 and $22.4 at July 31, 2020 and October 31, 2019, respectively Accounts and Other Receivables, Net, Current Provision for bad debt Accounts Receivable, Credit Loss Expense (Reversal) Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Interest rate swaps Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Accounting Policies [Abstract] Accounting Policies [Abstract] Income taxes payable Increase (Decrease) in Income Taxes Payable Additional Paid-in Capital Additional Paid-in Capital [Member] Revenues Revenue from Contract with Customer [Text Block] Finance leases Finance Lease, Weighted Average Remaining Lease Term Prepaid expenses Prepaid Expense, Current Deferred income tax liability, net Deferred Income Tax Liabilities, Net Nondeductible impairment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Deferred financing costs paid Payments of Financing Costs Debt maturities, 2021 Long-term Debt, Maturities, Repayments of Principal in Year Two Long-term lease liabilities Increase (Decrease) in Lease Liabilities, Noncurrent Increase (Decrease) in Lease Liabilities, Noncurrent Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Unamortized deferred financing costs Debt Issuance Costs, Current, Net Entity Address, State or Province Entity Address, State or Province Impairment of intangible assets, accumulated amortization Impairment of Intangible Assets, Finite-lived, Accumulated Amortization Impairment of Intangible Assets, Finite-lived, Accumulated Amortization Income Statement Location [Axis] Income Statement Location [Axis] Fiscal 2023 Capital Leases, Future Minimum Payments Due in Four Years Government Services Government Services [Member] Government Services [Member] Operating Segments Operating Segments [Member] Restructuring and related expenses Costs Recognized Restructuring Charges Class of Treasury Stock [Table] Class of Treasury Stock [Table] Weighted-average discount rate Leases, Weighted Average Discount Rate [Abstract] Leases, Weighted Average Discount Rate Interest Rate Swap, Maturity April 30, 2022 Interest Rate Swap, Maturity 4/30/2022 [Member] Interest Rate Swap, Maturity 4/30/2022 [Member] Intersegment Eliminations Elimination of inter-segment revenues Intersegment Eliminations [Member] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Self insurance retention amount per-claim Self Insured Retention Amount Per Occurrence Self Insured Retention Amount Per Occurrence Restricted insurance deposits Deposits [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Fiscal 2022 Capital Leases, Future Minimum Payments Due in Three Years Term Loan Loans Payable [Member] Net gains from cash flow hedges recorded in accumulated other comprehensive loss, net of tax OCI, before Reclassifications, before Tax, Attributable to Parent Education Education [Member] Education [Member] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Fiscal 2022 Finance Lease, Liability, Payments, Due Year Three Unusual or Infrequent Item, or Both [Line Items] Unusual or Infrequent Item, or Both [Line Items] Trade accounts payable Accounts Payable, Current Noncurrent liabilities Lessee, Lease Liabilities, Noncurrent [Abstract] Lessee, Lease Liabilities, Noncurrent Effective income tax rate, excluding impairment (percent) Effective Income Tax Rate Reconciliation, Excluding Impairment, Percent Effective Income Tax Rate Reconciliation, Excluding Impairment, Percent Finance lease, right-of-use asset Finance Lease, Right-of-Use Asset Entity Interactive Data Current Entity Interactive Data Current Common stock, shares issued (in shares) Common Stock, Shares, Issued Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Insurance recoverables Estimated Insurance Recoveries Discrete tax benefit from expiring statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Payments Payments for Restructuring Credit facility Debt Instrument, Fair Value Disclosure Instruments Used to Collateralize Insurance Obligations, Type [Domain] Instruments Used to Collateralize Insurance Obligations, Type [Domain] Instruments Used to Collateralize Insurance Obligations, Type [Domain] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Dividends Dividends [Abstract] Operating lease costs: Lease, Operating, Cost [Abstract] Lease, Operating, Cost Measurement Frequency [Axis] Measurement Frequency [Axis] Net Income (Loss) Per Common Share Earnings Per Share [Text Block] Operating expenses(4) Finance Lease, Right-of-Use Asset, Amortization Property, plant and equipment, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Income (loss) from discontinued operations (in usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Award Type [Domain] Award Type [Domain] Fiscal 2024 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Finance Lease, Liability, Payments, Due after Year Five Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Revolving Credit Facility Revolving Credit Facility [Member] Present value of lease liabilities Finance Lease, Liability Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] Dividends paid Payments of Ordinary Dividends, Common Stock Restricted stock units Restricted Stock Units (RSUs) [Member] Schedule of Credit Facility Information Schedule of Long-term Debt Instruments [Table Text Block] Right-of-use assets Increase (Decrease) in Operating Lease Right-Of-Use Asset Increase (Decrease) in Operating Lease Right-Of-Use Asset Effective income tax rate (percent) Effective Income Tax Rate Reconciliation, Percent Debt instrument, periodic payment, principal Debt Instrument, Periodic Payment, Principal Covenant Period, Quarter Ending October 2022 Covenant Period, Quarter Ending October 2022 [Member] Covenant Period, Quarter Ending October 2022 Non-Cash Items Restructuring Reserve, Settled without Cash Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Total liabilities Liabilities Share Repurchase Program [Axis] Share Repurchase Program [Axis] Common stock, $0.01 par value; 100,000,000 shares authorized; 66,676,970 and 66,571,427 shares issued and outstanding at July 31, 2020 and October 31, 2019, respectively Common Stock, Value, Issued Proceeds from redemption of auction rate security Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Decrease in total reserve claims Decrease In Total Reserve Claims Decrease In Total Reserve Claims Assets held in funded deferred compensation plan Deferred Compensation Plan Assets Fiscal 2021 Leases, Future Minimum Payments, Due in Two Years Leases, Future Minimum Payments, Due in Two Years Liability for Claims and Claims Adjustment Expense [Line Items] Liability for Claims and Claims Adjustment Expense [Line Items] Additional contract liabilities Contract with Customer, Liability, Increase (Decrease) for Additional Contract Liabilities Contract with Customer, Liability, Increase (Decrease) for Additional Contract Liabilities Debt maturities, 2020 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Asset Impairment Asset Impairment [Member] Asset Impairment [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Effect of dilutive securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Basic (in shares) Weighted-average common and common equivalent shares outstanding — Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Credit Facility Debt And Derivative Instruments Disclosure [Text Block] The entire disclosure for the entity's debt and derivative instruments. Includes information about the amount of borrowings under the entity's line of credit and other matters important to the users of the financial statements and describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising there from, and the amounts of and methodologies and assumptions used in determining the amounts of such items. Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Right-of-use assets Operating lease, right-of-use asset Operating Lease, Right-of-Use Asset Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Equity Components [Axis] Equity Components [Axis] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Insurance claim reserves Self Insurance Reserve Total guarantees Guarantor Obligations, Maximum Exposure, Undiscounted Total stockholders’ equity Balance, beginning of year Cumulative effect adjustment for adoption of Accounting Standards Update 2014-09 Balance, end of year Stockholders' Equity Attributable to Parent Operating expenses(1)(2) Operating Expense [Member] Amortization of intangible assets Amortization of Intangible Assets Contract liabilities, balance at beginning of period Contract liabilities, balance at end of period Contract with Customer, Liability, Current Total(2) Leases, Future Minimum Payments Due Leases, Future Minimum Payments Due Schedule of Insurance Related Balances and Activity Schedule Of Insurance Related Balances And Activity [Table Text Block] Schedule Of Insurance Related Balances And Activity [Table Text Block] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Proceeds from sale of assets Proceeds from Sale of Other Assets, Investing Activities Lease, Cost Lease, Cost [Table Text Block] Costs incurred in excess of amounts billed Contract with Customer, Asset, Net, Current Depreciation and amortization Depreciation, Depletion and Amortization Number of industry groups Number Of Industry Groups Number Of Industry Groups Capitalized contract cost, impairment loss Capitalized Contract Cost, Impairment Loss Thereafter Lessee, Leases, Liability, Payments, Due After Year Five Lessee, Leases, Liability, Payments, Due After Year Five Preferred stock, $0.01 par value; 500,000 shares authorized; none issued Preferred Stock, Value, Issued Eurodollar Eurodollar [Member] Variable Rate [Axis] Variable Rate [Axis] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Security Exchange Name Security Exchange Name Anti-dilutive (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Litigation Case [Axis] Litigation Case [Axis] Less: imputed interest Lessee, Leases, Liability, Undiscounted Excess Amount Lessee, Leases, Liability, Undiscounted Excess Amount Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Additional paid-in capital Additional Paid in Capital, Common Stock Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Equity Component [Domain] Equity Component [Domain] Unbilled trade receivables Contract with Customer, Asset, Unbilled Trade Receivables, Current Contract with Customer, Asset, Unbilled Trade Receivables, Current Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Contract with Customer, Liabilities [Roll Forward] Contract with Customer, Liabilities [Roll Forward] Contract with Customer, Liabilities [Roll Forward] Document Transition Report Document Transition Report Tax to be reclassified during next 12 months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Tax Amount Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Tax Amount Stock options Share-based Payment Arrangement, Option [Member] Interest Rate Swap, Maturity April 30, 2021 Interest Rate Swap, Maturity 4/30/2021 [Member] Interest Rate Swap, Maturity 4/30/2021 [Member] Share repurchase program authorized amount Stock Repurchase Program, Authorized Amount Deferred financing costs Debt Issuance Costs, Gross Repayment of finance leases Financing cash flows from finance leases Finance Lease, Principal Payments Goodwill, impairment loss Goodwill, Impairment Loss Fiscal 2024 Lessee, Leases, Liability, Payments, Due Year Five Lessee, Leases, Liability, Payments, Due Year Five Line of Credit Line of Credit [Member] Operating profit (loss) Segment Reporting Information, Profit (Loss) [Abstract] Fiscal 2022 Operating Leases, Future Minimum Payments, Due in Three Years Schedule of New Accounting Pronouncements Impacts on Consolidated Financial Statements Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Income Statement [Abstract] Income Statement [Abstract] Interest rate swap liabilities Interest Rate Derivative Liabilities, at Fair Value Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Unamortized deferred financing costs Debt Issuance Costs, Noncurrent, Net Restructuring Plan [Domain] Restructuring Plan [Domain] Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations