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Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Sep. 27, 2024 | Apr. 26, 2019 | Dec. 27, 2024 | Dec. 29, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Investment in equity securities | $ 749,468 |  | $ 597,939 |
Total Other (Expense) Income, net |  |  | (155,271) | $ (38,795)
Transition services agreement, expenses incurred |  |  | (11,400) |
Net (loss) earnings attributable to Jacobs from discontinued operations |  |  | (1,001) | 43,264
Worley Stock |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ordinary shares included in purchase price (in shares) |  | 58,200,000 |  |
Net (loss) earnings attributable to Jacobs from discontinued operations |  |  | 0 | 600
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 | 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 |  |  |
Net (loss) earnings attributable to Jacobs from discontinued operations |  |  | (1,001) | $ 43,838
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) | 29,000,000 |  |  |
Equity method investment retained, shares transferred to escrow (in shares) | 11,000,000 |  |  |
Equity method investment retained, fair value after disposal |  |  | 597,900 |
Equity method investment retained after disposal, mark-to market losses |  |  | $ 145,200 |
Equity method investment retained after disposal, investment disposal period | 12 months |  |  |

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