v3.26.1
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. 26, 2026
USD ($)
Goodwill [Roll Forward]  
Balance at the beginning of the period $ 4,780,818
Foreign currency translation adjustments and other (24,357)
Balance at the end of the period 4,756,461
Infrastructure & Advanced Facilities  
Goodwill [Roll Forward]  
Balance at the beginning of the period 3,351,490
Foreign currency translation adjustments and other (2,727)
Balance at the end of the period 3,348,763
PA Consulting  
Goodwill [Roll Forward]  
Balance at the beginning of the period 1,429,328
Foreign currency translation adjustments and other (21,630)
Balance at the end of the period $ 1,407,698