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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. 31, 2021
USD ($)
Goodwill [Roll Forward]  
Balance at the beginning of the period $ 7,197,000
Acquired 158,498
Foreign Exchange Impact (7,201)
Post-Acquisition Adjustments 2,197
Balance at the end of the period 7,350,494
Critical Mission Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 2,550,631
Acquired 158,498
Foreign Exchange Impact (698)
Post-Acquisition Adjustments 0
Balance at the end of the period 2,708,431
People & Places Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 3,240,783
Acquired 0
Foreign Exchange Impact (1,335)
Post-Acquisition Adjustments 0
Balance at the end of the period 3,239,448
PA Consulting  
Goodwill [Roll Forward]  
Balance at the beginning of the period 1,405,586
Acquired 0
Foreign Exchange Impact (5,168)
Post-Acquisition Adjustments 2,197
Balance at the end of the period $ 1,402,615