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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