PA Consulting Redeemable Noncontrolling Interests - Schedule of Change in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2025	Mar. 29, 2024	Mar. 28, 2025	Mar. 29, 2024
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interest, beginning balance			$ 17,836
Attribution of Preferred Dividend to Common Shareholders	$ (1,160)	$ (9,568)	(3,469)	$ (14,081)
Redeemable noncontrolling interest, ending balance	8,716		8,716
PA Consulting Employees
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interest, beginning balance			820,182
Accrued Preferred Dividend to Preference Shareholders			37,960
Attribution of Preferred Dividend to Common Shareholders			(37,960)
Net earnings attributable to redeemable noncontrolling interests to Common Shareholders			12,863
Redeemable Noncontrolling interests redemption value adjustment			8,491
Repurchase of redeemable noncontrolling interests			(5,145)
Cumulative translation adjustments and other			(14,850)
Redeemable noncontrolling interest, ending balance	$ 821,541		$ 821,541