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PA Consulting Redeemable Noncontrolling Interests - Schedule of Change in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2025	Jun. 28, 2024	Jun. 27, 2025	Jun. 28, 2024
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interest, beginning balance			$ 17,836
Attribution of Preferred Dividend to Common Shareholders	$ (3,929)	$ (3,262)	(7,398)	$ (17,342)
Redeemable noncontrolling interest, ending balance	9,229		9,229
PA Consulting Employees
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interest, beginning balance			820,182
Accrued Preferred Dividend to Preference Shareholders			59,792
Attribution of Preferred Dividend to Common Shareholders			(59,792)
Net earnings attributable to redeemable noncontrolling interests to Common Shareholders			18,539
Redeemable Noncontrolling interests redemption value adjustment			68,031
Repurchase of redeemable noncontrolling interests			(11,003)
Cumulative translation adjustments and other			12,603
Redeemable noncontrolling interest, ending balance	$ 908,352		$ 908,352

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Noncontrolling Interest, Increase from Cumulative Translation Adjustment and Other

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Amount of equity (deficit) attributable to noncontrolling interest. Excludes temporary equity.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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