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Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 27, 2024
Dec. 29, 2023
Revenues from External Customers:    
Revenues $ 2,932,956 $ 2,810,227
Segment Operating Profit:    
Total Segment Operating Profit 208,418 142,000
Restructuring, Transaction and Other Charges (16,096) (41,347)
Total Other (Expense) Income, net (155,271) (38,795)
Earnings from Continuing Operations Before Taxes 53,147 103,205
Amortization of intangible assets 38,661  
Restructuring charges 14,740  
Amentum Holdings, Inc. | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SpinCo Business    
Segment Operating Profit:    
Equity method investment retained after disposal, mark-to market losses 145,200  
CH2M HILL Companies, Ltd.    
Segment Operating Profit:    
Restructuring charges 14,740 38,354
CH2M HILL Companies, Ltd. | Professional Services and Employee Seperation    
Segment Operating Profit:    
Restructuring charges 15,000 37,100
Operating Segments    
Segment Operating Profit:    
Total Segment Operating Profit 224,514 183,347
Corporate | Other Expense    
Segment Operating Profit:    
Amortization of intangible assets 38,700 36,900
Operating profit, excluding intangible amortization and other corporate transaction related costs 210,300 167,400
PA Consulting | Operating Segments    
Revenues from External Customers:    
Revenues 306,748 306,001
Segment Operating Profit:    
Total Segment Operating Profit 66,738 54,455
PA Consulting | Operating Segments | CH2M HILL Companies, Ltd.    
Segment Operating Profit:    
Restructuring charges (236) 1,175
Infrastructure & Advanced Facilities | Operating Segments    
Revenues from External Customers:    
Revenues 2,626,208 2,504,226
Segment Operating Profit:    
Total Segment Operating Profit $ 157,776 $ 128,892