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hedges recorded in accumulated other comprehensive loss, net of tax OCI, before Reclassifications, before Tax, Attributable to Parent Interest Rate Swap, Maturity April 30, 2022 Interest Rate Swap, Maturity 4/30/2022 [Member] Interest Rate Swap, Maturity 4/30/2022 [Member] Self insurance retention amount per-claim Self Insured Retention Amount Per Occurrence Self Insured Retention Amount Per Occurrence Line of credit facility, term Debt Instrument, Term Education Education [Member] Education [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Property, plant and equipment, net of accumulated depreciation of $266.5 and $241.3 at July 31, 2021 and October 31, 2020, respectively Carrying value of fixed assets Property, Plant and Equipment, Net Effective income tax rate, excluding impairment Effective Income Tax Rate Reconciliation, Excluding Impairment, Percent Effective Income Tax Rate Reconciliation, Excluding Impairment, Percent Other noncurrent liabilities Other 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contingency accrual Loss Contingency Accrual Income from discontinued operations (in USD per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Long-term debt, net Long-term debt Long-term Debt, Excluding Current Maturities Document Fiscal Period Focus Document Fiscal Period Focus Effective income tax rate (percent) Effective Income Tax Rate Reconciliation, Percent Amount of reasonably possible loss Loss Contingency, Estimate of Possible Loss Right-of-use assets Increase (Decrease) In Operating Lease Right-Of-Use Asset Increase (Decrease) In Operating Lease Right-Of-Use Asset Liability for Claims and Claims Adjustment Expense [Table] Liability for Claims and Claims Adjustment Expense [Table] Cash and cash equivalents at beginning of year Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Costs incurred in excess of amounts billed Contract with Customer, Asset, after Allowance for Credit Loss, Current Common stock, par value (in USD per share) Common Stock, Par or Stated Value Per Share Current assets Assets, Current [Abstract] Decrease in total reserve claims Decrease In Total Reserve Claims Decrease In Total Reserve Claims Entity Central Index Key Entity Central Index Key Security Exchange Name Security Exchange Name Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Income from discontinued operations, net of taxes Income from discontinued operations, net of taxes Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Management Reimbursement Revenue by Segment and Remaining Performance Obligations Revenue from Contract with Customer [Policy Text Block] Diluted (in shares) Weighted-average common and common equivalent shares outstanding — Diluted (in shares) Weighted Average Number of Shares 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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. Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Schedule of Anti-Dilutive Outstanding Stock Awards Issued Under Share-Based Compensation Plans Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Primary policy limit Workers Compensation General Liability And Other Insurable Risks Insurance Policy Limit Represents the policy limit provided by the insurance program for workers' compensation, general liability, and other insurable risks. Changes in operating assets and liabilities Increase (Decrease) in Operating Capital [Abstract] Property, plant and equipment, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Total current liabilities Liabilities, Current Taxes withheld from issuance of share-based compensation awards, net Payment, Tax Withholding, Share-based Payment Arrangement Cash payment to acquire companies Payments to Acquire Businesses, Gross 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] Intersegment Eliminations Elimination of inter-segment revenues Intersegment Eliminations [Member] Litigation Status [Domain] Litigation Status [Domain] Line of credit facility, borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Loss Contingencies [Table] Loss Contingencies [Table] Additional contract liabilities Contract With Customer, Liability, Increase (Decrease) For Additional Contract Liabilities Contract With Customer, Liability, Increase (Decrease) For Additional Contract Liabilities Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Number of industry groups Number Of Industry Groups Number Of Industry Groups Net cash provided by operating activities of continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security Statement [Table] Statement [Table] Other current assets Other Assets, Current Recently Adopted Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Other noncurrent assets Increase (Decrease) in Other Noncurrent Assets Statistical Measurement [Axis] Statistical Measurement [Axis] Unbilled trade receivables Contract With Customer, Asset, Unbilled Trade Receivables, Current Contract With Customer, Asset, Unbilled Trade Receivables, Current Subsequent Event Subsequent Event [Member] Contract with Customer, Liabilities [Roll Forward] Contract with Customer, Liabilities [Roll Forward] Contract with Customer, Liabilities [Roll Forward] Cover page. Cover [Abstract] Goodwill Goodwill Other intangible assets, net of accumulated amortization of $376.5 and $343.8 at July 31, 2021 and October 31, 2020, respectively Finite-Lived Intangible Assets, Net Income taxes payable Accrued Income Taxes, Current Scenario [Domain] Scenario [Domain] Insurance claim reserves Self Insurance Reserve The Company and Nature of Operations Nature of Operations [Text Block] Adjustments to reconcile income (loss) from continuing operations to net cash provided by operating activities of continuing operations Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Tax to be reclassified during the next 12 months Interest Rate Cash Flow Hedge Gain (Loss) To Be Reclassified During Next 12 Months, Tax Interest Rate Cash Flow Hedge Gain (Loss) To Be Reclassified During Next 12 Months, Tax Deferred income taxes Deferred Income Tax Expense (Benefit)