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Discontinued Operations- Schedule of Earnings (Loss) From Discontinued Operations, Net of tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 26, 2025 | Sep. 27, 2024 | Sep. 29, 2023
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Net (Loss) Earnings of the Group from Discontinued Operations | $ (23,966) | $ 206,850 | $ 300,017
Net Earnings Attributable to Noncontrolling Interests from Discontinued Operations | 0 | (13,561) | (13,365)
Net (Loss) Earnings Attributable to Jacobs from Discontinued Operations | (23,966) | 193,289 | 286,652
Disposal group, including discontinued operation, liabilities | 30,800 |  |
Professional services and other transaction related expenses |  | 97,600 |
Discontinued Operations, Spinoff | SpinCo Business |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Revenues | (3,200) | 5,472,979 | 5,500,994
Direct cost of contracts | 3,528 | (4,692,921) | (4,738,539)
Gross profit | 328 | 780,058 | 762,455
Selling, general and administrative expense | (34,716) | (479,582) | (363,703)
Operating (Loss) Profit | (34,388) | 300,476 | 398,752
Other loss, net | 0 | (3,301) | (3,049)
(Loss) Earnings Before Taxes from Discontinued Operations | (34,388) | 297,175 | 395,703
Income Tax Benefit (Expense) | 7,742 | (89,737) | (94,845)
Net (Loss) Earnings of the Group from Discontinued Operations | (26,646) | 207,438 | 300,858
Net Earnings Attributable to Noncontrolling Interests from Discontinued Operations | 0 | (13,561) | (13,365)
Net (Loss) Earnings Attributable to Jacobs from Discontinued Operations | $ (26,646) | $ 193,877 | $ 287,493

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- Definition Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482659/740-20-45-2 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147483475/205-20-45-3A Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5C -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483499/205-20-50-5C Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147483475/205-20-45-3B Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483475/205-20-45-4 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483499/205-20-50-1 + Details
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