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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. 30, 2023
USD ($)
Goodwill [Roll Forward]  
Balance at the beginning of the period $ 7,184,658
Acquired 11,956
Post-Acquisition Adjustments 739
Foreign currency translation and other 217,205
Balance at the end of the period 7,414,558
Critical Mission Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 2,251,724
Acquired 0
Post-Acquisition Adjustments 0
Foreign currency translation and other (1,379)
Balance at the end of the period 2,250,345
People & Places Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 3,196,796
Acquired 0
Post-Acquisition Adjustments (138)
Foreign currency translation and other 20,421
Balance at the end of the period 3,217,079
Divergent Solutions  
Goodwill [Roll Forward]  
Balance at the beginning of the period 576,986
Acquired 0
Post-Acquisition Adjustments 0
Foreign currency translation and other 20,148
Balance at the end of the period 597,134
PA Consulting  
Goodwill [Roll Forward]  
Balance at the beginning of the period 1,159,152
Acquired 11,956
Post-Acquisition Adjustments 877
Foreign currency translation and other 178,015
Balance at the end of the period $ 1,350,000