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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
 9 Months Ended
Jun. 27, 2025
USD ($)
Goodwill [Roll Forward]  
Balance at the beginning of the period $ 4,788,181
Foreign currency translation adjustments and other 31,992
Balance at the end of the period 4,820,173
Infrastructure & Advanced Facilities  
Goodwill [Roll Forward]  
Balance at the beginning of the period 3,362,760
Foreign currency translation adjustments and other (4,701)
Balance at the end of the period 3,358,059
PA Consulting  
Goodwill [Roll Forward]  
Balance at the beginning of the period 1,425,421
Foreign currency translation adjustments and other 36,693
Balance at the end of the period $ 1,462,114