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Goodwill and Intangibles - Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets (Details) $ in Thousands	12 Months Ended
	Sep. 27, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 4,644,087
Foreign currency translation and other	144,094
Ending balance	4,788,181
Infrastructure & Advanced Facilities
Goodwill [Roll Forward]
Beginning balance	3,349,451
Foreign currency translation and other	13,309
Ending balance	3,362,760
PA Consulting
Goodwill [Roll Forward]
Beginning balance	1,294,636
Foreign currency translation and other	130,785
Ending balance	$ 1,425,421

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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