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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
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Sep. 26, 2025 USD ($)
Goodwill [Roll Forward] |
Beginning balance | $ 4,788,181
Foreign currency translation and other | (7,363)
Ending balance | 4,780,818
Infrastructure & Advanced Facilities |
Goodwill [Roll Forward] |
Beginning balance | 3,362,760
Foreign currency translation and other | (11,270)
Ending balance | 3,351,490
PA Consulting |
Goodwill [Roll Forward] |
Beginning balance | 1,425,421
Foreign currency translation and other | 3,907
Ending balance | $ 1,429,328

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-4 + Details
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