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PA Consulting Redeemable Noncontrolling Interests - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 27, 2024	Mar. 28, 2025	Mar. 29, 2024	Sep. 27, 2024
Business Acquisition [Line Items]
Repurchase of redeemable noncontrolling interests		$ 4,066	$ 24,360
Preference share effect on basic earnings per share (in dollars per share)	$ 0.05		$ 0.01
PA Consulting Group Limited
Business Acquisition [Line Items]
Allocated share-based compensation expense		13,900	$ 6,800
Cash in employee benefit trust		$ 800		$ 2,100
PA Consulting Employees
Business Acquisition [Line Items]
Ownership interest of employees		71.00%		71.00%

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
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The cash outflow during the period for redemption of redeemable noncontrolling interests.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
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-Section 45
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