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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 9 Months Ended
Mar. 13, 2025
Jun. 27, 2025
Jun. 28, 2024
Jun. 27, 2025
Jun. 28, 2024
Revenues from External Customers:          
Revenues   $ 3,031,768 $ 2,883,384 $ 8,875,139 $ 8,540,791
Segment Operating Profit:          
Total Segment Operating Profit   235,014 170,986 652,079 496,231
Restructuring, Transaction and Other Charges   (34,134) (61,762) (87,991) (147,223)
Amortization of Intangible Assets   (39,245) (38,312) (115,946) (113,718)
Total Other Income (Expense), net   10,090 (34,521) (298,006) (112,551)
Earnings from Continuing Operations Before Taxes   245,104 136,465 354,073 383,680
Restructuring charges       47,657  
Transition services agreement, expenses incurred   9,800   31,500  
Loss on extinguishment of debt   0 0 20,510 0
Revolving Credit Facility | 2021 Term Loan Facility          
Segment Operating Profit:          
Loss on extinguishment of debt $ 20,500     20,500  
CH2M HILL Companies, Ltd.          
Segment Operating Profit:          
Restructuring charges   22,254 53,971 47,657 127,687
CH2M HILL Companies, Ltd. | Professional Services and Employee Seperation          
Segment Operating Profit:          
Restructuring charges   $ 22,000 50,800 $ 47,100 120,300
Joint Venture          
Segment Operating Profit:          
Equity Method Investment, Ownership Percentage   50.00%   50.00%  
Amentum Holdings, Inc.          
Segment Operating Profit:          
Restructuring charges   $ 4,700   $ 20,900  
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 gains (losses)   27,400   (227,300)  
Transition services agreement, expenses incurred   9,800   31,500  
Operating Segments          
Segment Operating Profit:          
Total Segment Operating Profit   308,393 271,060 856,016 757,172
Infrastructure & Advanced Facilities | Operating Segments          
Revenues from External Customers:          
Revenues   2,699,062 2,595,113 7,928,023 7,652,552
Segment Operating Profit:          
Total Segment Operating Profit   235,975 208,171 649,514 579,659
PA Consulting | Operating Segments          
Revenues from External Customers:          
Revenues   332,706 288,271 947,116 888,239
Segment Operating Profit:          
Total Segment Operating Profit   72,418 62,889 206,502 177,513
PA Consulting | Operating Segments | CH2M HILL Companies, Ltd.          
Segment Operating Profit:          
Restructuring charges   $ 0 $ 3,201 $ 259 $ 7,360