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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. 28, 2024
USD ($)
Goodwill [Roll Forward]  
Balance at the beginning of the period $ 7,343,526
Foreign currency translation and other 61,341
Balance at the end of the period 7,404,867
Critical Mission Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 2,244,985
Foreign currency translation and other 4,854
Balance at the end of the period 2,249,839
People & Places Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 3,208,193
Foreign currency translation and other 6,437
Balance at the end of the period 3,214,630
Divergent Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 595,712
Foreign currency translation and other 1,289
Balance at the end of the period 597,001
PA Consulting  
Goodwill [Roll Forward]  
Balance at the beginning of the period 1,294,636
Foreign currency translation and other 48,761
Balance at the end of the period $ 1,343,397