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Discontinued Operations- Schedule of Earnings (Loss) From Discontinued Operations, Net of tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 27, 2026 | Mar. 28, 2025 | Mar. 27, 2026 | Mar. 28, 2025
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |
Net (Loss) Earnings of the Group from Discontinued Operations | $ (2,890) | $ (5,550) | $ (2,336) | $ (6,551)
Net Loss Attributable to Jacobs from Discontinued Operations | (2,890) | (5,550) | (2,336) | (6,551)
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SpinCo Business |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |
Revenues | 0 | (67) | 0 | (3)
Direct cost of contracts | 0 | 58 | 0 | (3)
Gross (loss) profit | 0 | (9) | 0 | (6)
Selling, general and administrative expense | (345) | (5,683) | 142 | (7,031)
Operating (Loss) Profit | (345) | (5,692) | 142 | (7,037)
Other expense, net | (2,641) | 0 | (2,641) | 0
(Loss) Earnings Before Taxes from Discontinued Operations | (2,986) | (5,692) | (2,499) | (7,037)
Income Tax Benefit (Expense) | 88 | 132 | 155 | 475
Net (Loss) Earnings of the Group from Discontinued Operations | (2,898) | (5,560) | (2,344) | (6,562)
Net Earnings Attributable to Noncontrolling Interests from Discontinued Operations | 0 | 0 | 0 | 0
Net Loss Attributable to Jacobs from Discontinued Operations | (2,898) | $ (5,560) | (2,344) | $ (6,562)
Disposal group, including discontinued operation, foreign tax indemnity reserve release | $ 2,600 |  | $ 2,600 |

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