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Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2025 | Apr. 10, 2025 | Apr. 07, 2025 | Mar. 14, 2025 | Sep. 27, 2024 | Apr. 26, 2019 | Mar. 28, 2025 | Feb. 28, 2025 | Jun. 27, 2025 | Jun. 28, 2024 | Jun. 27, 2025 | Jun. 28, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment in equity securities |  |  |  |  | $ 749,468 |  |  |  | $ 0 |  | $ 0 |
Miscellaneous income (expense), net |  |  |  |  |  |  |  |  | 38,844 | $ 1,550 | (194,523) | $ (5,118)
Fair value mark-to-market, amount |  |  |  |  |  |  |  |  | 27,400 |  | 227,300 |
Transition services agreement, expenses incurred |  |  |  |  |  |  |  |  | 9,800 |  | 31,500 |
Net (loss) earnings attributable to Jacobs from discontinued operations |  |  |  |  |  |  |  |  | (1,629) | 64,010 | (8,180) | 177,152
Worley Stock |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares included in purchase price |  |  |  |  |  | $ 58,200 |  |  |  |  |  |
Net (loss) earnings attributable to Jacobs from discontinued operations |  |  |  |  |  |  |  |  | 500 | 500 | 500 | (900)
Worley |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | 3,400,000 |  |  |  |  |  |
Consideration paid in cash |  |  |  |  |  | $ 2,800,000 |  |  |  |  |  |
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Amentum Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operation, remaining shares held in escrow (in shares) |  |  | 9,700,000 |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SpinCo Business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, spinoff transaction ( in shares) |  |  |  |  | 124,084,108 |  |  |  |  |  |  |
Shares issued during period, spinoff, conversion ratio (in shares) |  |  |  |  | 1 |  |  |  |  |  |  |
Cash received from SpinCo business |  |  |  |  | $ 911,000 |  |  |  |  |  |  |
Discontinued operation, working capital adjustment |  |  |  |  |  |  | $ 70,000 |  |  |  |  |
Discontinued operation, working capital adjustment, reduction in recorded receivable |  |  |  |  |  |  | $ 24,000 |  |  |  |  |
Discontinued operation, receivable balance collected |  | $ 70,000 |  |  |  |  |  |  |  |  |  |
Discontinued operation, remaining shares held in escrow (in shares) | 7,300,000 |  | 7,300,000 |  |  |  |  |  |  |  |  |
Net (loss) earnings attributable to Jacobs from discontinued operations |  |  |  |  |  |  |  |  | (2,085) | $ 63,525 | (8,647) | $ 178,010
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SpinCo Business | Amentum Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment retained, shares owned after disposal (in shares) |  |  |  |  | 29,200,000 |  |  |  |  |  |  |
Equity method investment retained, shares transferred to escrow (in shares) |  |  |  |  | 10,900,000 |  |  |  |  |  |  |
Discontinued operation, remaining shares held in escrow (in shares) |  |  | 2,400,000 | 9,700,000 | 18,300,000 |  |  |  |  |  |  |
Investment in equity securities |  |  |  |  | $ 749,500 |  |  |  |  |  |  |
Discontinued operation, entitled to receive shares held in escrow (in shares) |  |  |  |  |  |  |  | 1,200,000 |  |  |  |
Miscellaneous income (expense), net |  |  | $ 21,900 |  |  |  |  |  |  |  |  |
Transition services agreement, expenses incurred |  |  |  |  |  |  |  |  | $ 9,800 |  | $ 31,500 |

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