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Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Sep. 26, 2025 | Apr. 30, 2025 | Apr. 10, 2025 | Apr. 07, 2025 | Mar. 14, 2025 | Sep. 27, 2024 | Apr. 26, 2019 | Mar. 31, 2025 | Feb. 28, 2025 | Sep. 26, 2025 | Sep. 27, 2024 | Sep. 29, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Final settlement of the escrow shares at a recorded fair value | $ 0 |  |  |  |  | $ 749,468 |  |  |  | $ 0 | $ 749,468 |
Charge to miscellaneous expense |  |  |  |  |  |  |  |  |  | 189,663 | (219,454) | $ 12,399
Equity method investment retained after disposal, mark-to market (losses) gains |  |  |  |  |  |  |  |  |  | (227,300) | 186,900 |
Transition services agreement, income |  |  |  |  |  |  |  |  |  | 40,500 |  |
Net (Loss) Earnings Attributable to Jacobs from Discontinued Operations |  |  |  |  |  |  |  |  |  | (23,966) | 193,289 | 286,652
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 |  |  |  |  |  |  |  |  |  | 2,700 | (600) | (800)
ECR Business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 3,400,000 |  |  |  |  |
Business combination consideration paid in cash |  |  |  |  |  |  | $ 2,800,000 |  |  |  |  |
Discontinued Operations, 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, Spinoff | SpinCo Business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution to shareholders, pro rata basis (in shares) |  |  |  |  |  | 124,084,108 |  |  |  |  |  |
Distribution to shareholders, conversion ratio (in shares) | 1 |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  | (26,646) | $ 193,877 | $ 287,493
Discontinued Operations, 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 |  |  |  |  | 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 |  |  |  |  |  |
Final settlement of the escrow shares at a recorded fair value |  |  |  |  |  | $ 749,500 |  |  |  |  | $ 749,500 |
Discontinued operation, entitled to receive shares held in escrow (in shares) |  |  |  |  |  |  |  |  | 1,200,000 |  |  |
Charge to miscellaneous expense |  |  |  | $ 21,900 |  |  |  |  |  |  |  |
Equity method investment retained after disposal, mark-to market (losses) gains |  |  |  |  |  |  |  |  |  | (227,300) | $ 186,900 |
Transition services agreement, income |  |  |  |  |  |  |  |  |  | $ 40,500 |  |

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