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PA Consulting Business Combination - Change in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Oct. 01, 2021	Oct. 02, 2020
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Noncontrolling interests - distributions and other	$ (27,248)	$ (44,372)	$ (41,032)
Noncontrolling interest, Ending balance	44,336	34,796
Preferred redeemable noncontrolling interests redemption value adjustment	0	$ (57,307)	$ 0
PA Consulting Employees
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Noncontrolling interest, Beginning balance	657,722
Accrued Preferred Dividend to Preference Shareholders	67,598
Noncontrolling interests - distributions and other	(67,598)
Net earnings attributable to redeemable noncontrolling interest to Common Shareholders	34,585
Redeemable Noncontrolling interests redemption value adjustment	27,657
Repurchase of redeemable noncontrolling interests	(53,834)
Issuance of redeemable noncontrolling interests	54,884
Cumulative translation adjustment and other	(88,492)
Noncontrolling interest, Ending balance	$ 632,522

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