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v3.26.1

Segment Information - Schedule of Total Revenues, Segment Operating Profit and Total Asset for Reporting Segment (Details) $ in Thousands, £ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 02, 2026 GBP (£) | Mar. 27, 2026 USD ($) | Mar. 28, 2025 USD ($) | Mar. 27, 2026 USD ($) | Mar. 28, 2025 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from External Customers |  | $ 3,694,881 | $ 2,910,415 | $ 6,988,162 | $ 5,843,371
Direct cost of contracts |  | (2,899,988) | (2,172,070) | (5,428,019) | (4,383,759)
Selling, general and administrative expenses |  | (876,069) | (529,697) | (1,408,758) | (1,042,546)
Segment Operating Profit |  | (81,176) | 208,648 | 151,385 | 417,066
Restructuring, Transaction and Other Charges |  | (352,200) | (23,924) | (381,277) | (53,856)
Amortization of Intangible Assets |  | (34,063) | (38,040) | (72,059) | (76,701)
Total Other (Expense) Income, net |  | (49,430) | (152,825) | (75,769) | (308,095)
(Loss) Earnings from Continuing Operations Before Taxes |  | (130,606) | 55,823 | 75,616 | 108,971
Allocated share-based compensation expense |  |  | 8,000 |  | 13,900
Restructuring and other charges |  | 14,171 | 10,663 | 18,169 | 25,403
Equity method investment retained after disposal, mark-to market losses |  |  | 109,500 |  | 254,700
Loss on extinguishment of debt |  | 0 | 20,510 | 0 | 20,510
Equity-Based Incentive Grants |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Allocated share-based compensation expense |  | 214,900 |  | 237,500 | 13,900
Foreign Exchange Forward |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on derivatives, before taxes |  | (20,500) |  | (20,500) |
Amentum Holdings, Inc. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring and other charges |  |  | 8,400 |  | 16,200
Amentum Holdings, Inc. | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SpinCo Business |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Discontinued Operation, Transition Services Agreement, Income (Expenses) |  |  | $ 10,300 |  | $ 21,700
Joint Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Ownership percentage |  |  | 50.00% |  | 50.00%
Professional Services and Employee Seperation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring and other charges |  | 7,600 | $ 10,200 | 9,900 | $ 25,100
PA Consulting Group Limited |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Pre-tax transaction costs |  | 120,400 |  | 122,700 |
Consideration paid in cash | £ 997.6 |  |  | 123,900 |
Restructuring and other charges |  | 6,500 |  | 8,300 |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from External Customers |  | 3,694,881 | 2,910,415 | 6,988,162 | 5,843,371
Direct cost of contracts |  | (2,899,988) | (2,172,070) | (5,428,019) | (4,383,759)
Selling, general and administrative expenses |  | (489,806) | (467,733) | (955,422) | (911,989)
Segment Operating Profit |  | 305,087 | 270,612 | 604,721 | 547,623
Infrastructure & Advanced Facilities | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from External Customers |  | 3,336,307 | 2,602,753 | 6,275,155 | 5,228,961
Direct cost of contracts |  | (2,666,239) | (1,980,582) | (4,959,401) | (4,000,277)
Selling, general and administrative expenses |  | (444,845) | (418,906) | (875,789) | (815,145)
Segment Operating Profit |  | 225,223 | 203,265 | 439,965 | 413,539
Restructuring and other charges |  | 7,649 | 10,168 | 9,890 | 25,144
PA Consulting | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from External Customers |  | 358,574 | 307,662 | 713,007 | 614,410
Direct cost of contracts |  | (233,749) | (191,488) | (468,618) | (383,482)
Selling, general and administrative expenses |  | (44,961) | (48,827) | (79,633) | (96,844)
Segment Operating Profit |  | 79,864 | 67,347 | 164,756 | 134,084
Restructuring and other charges |  | $ 6,522 | $ 495 | $ 8,279 | $ 259

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