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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. 02, 2021
USD ($)
Goodwill [Roll Forward]  
Balance at the beginning of the period $ 5,639,091
Acquired 1,573,015
Foreign Exchange Impact 18,552
Post-Acquisition Adjustments 1,612
Balance at the end of the period 7,232,270
Critical Mission Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 2,409,081
Acquired 130,691
Foreign Exchange Impact 13,592
Post-Acquisition Adjustments 1,612
Balance at the end of the period 2,554,976
People & Places Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 3,230,010
Acquired 0
Foreign Exchange Impact 15,672
Post-Acquisition Adjustments 0
Balance at the end of the period 3,245,682
PA Consulting  
Goodwill [Roll Forward]  
Balance at the beginning of the period 0
Acquired 1,442,324
Foreign Exchange Impact (10,712)
Post-Acquisition Adjustments 0
Balance at the end of the period $ 1,431,612