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Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended								12 Months Ended
	Sep. 27, 2024	Apr. 26, 2019	Sep. 27, 2024	Jun. 28, 2024	Mar. 29, 2024	Dec. 29, 2023	Sep. 29, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 30, 2022	Sep. 27, 2024	Sep. 29, 2023	Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net earnings (loss) attributable to Jacobs from discontinued operations			$ 16,138	$ 64,009	$ 69,877	$ 43,265	$ 77,972	$ 73,929	$ 75,527	$ 59,224	$ 193,289	$ 286,652	$ 289,875
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 earnings (loss) attributable to Jacobs from discontinued operations											(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 | 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
Cash received from SpinCo business	$ 911,000
Net earnings (loss) attributable to Jacobs from discontinued operations											$ 193,877	$ 287,493	$ 289,907
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)	29,000,000		29,000,000								29,000,000
Equity method investment retained, shares transferred to escrow (in shares)	11,000,000
Equity method investment retained, fair value after disposal	$ 749,500		$ 749,500								$ 749,500
Equity method investment retained after disposal, mark-to market gains			$ 186,900								$ 186,900
Equity method investment retained after disposal, investment disposal period	12 months		12 months								12 months

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