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Severance - Narrative (Details) $ in Millions	9 Months Ended
	Jun. 30, 2023 USD ($)
Accrued Payroll and Related Expenses | Employee Severance and Other Costs
Restructuring Cost and Reserve [Line Items]
Severance and related costs accrual	$ 22.3
Cost of services provided (exclusive of depreciation and amortization) / Selling and general corporate expenses
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 36.3

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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