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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
Jul. 01, 2022
USD ($)
Goodwill [Roll Forward]  
Balance at the beginning of the period $ 7,197,000
Acquired 335,219
Foreign currency translation (209,555)
Post-Acquisition Adjustments 5,720
Balance at the end of the period 7,328,384
Critical Mission Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 2,550,631
Acquired 197,227
Foreign currency translation (18,043)
Post-Acquisition Adjustments 0
Balance at the end of the period 2,729,815
People & Places Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 3,240,783
Acquired 116,657
Foreign currency translation (29,688)
Post-Acquisition Adjustments 0
Balance at the end of the period 3,327,752
PA Consulting  
Goodwill [Roll Forward]  
Balance at the beginning of the period 1,405,586
Acquired 21,335
Foreign currency translation (161,824)
Post-Acquisition Adjustments 5,720
Balance at the end of the period $ 1,270,817