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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
 3 Months Ended
Dec. 27, 2024
USD ($)
Goodwill [Roll Forward]  
Balance at the beginning of the period $ 4,788,181
Foreign currency translation and other (104,825)
Balance at the end of the period 4,683,356
Infrastructure & Advanced Facilities  
Goodwill [Roll Forward]  
Balance at the beginning of the period 3,362,760
Foreign currency translation and other (20,125)
Balance at the end of the period 3,342,635
PA Consulting  
Goodwill [Roll Forward]  
Balance at the beginning of the period 1,425,421
Foreign currency translation and other (84,700)
Balance at the end of the period $ 1,340,721