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Employee Stock Purchase and Stock Incentive Plans - Schedule of Unvested Restricted Stock and Restricted Stock Units Roll Forward (Details) - Restricted Stock And Restricted Stock Units
 12 Months Ended
Sep. 27, 2024
$ / shares
shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Beginning balance outstanding (in shares) | shares 1,890,148
Restricted stock and restricted stock units issued (in shares) | shares 383,427
Vested (in shares) | shares (843,877)
Canceled (in shares) | shares (83,326)
Awards transferred to Amentum in the Separation Transaction (in shares) | shares (66,950)
Adjustment to Jacobs awards related to the Separation Transaction (in shares) | shares 295,465
Ending balance outstanding (in shares) | shares 1,574,887
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Beginning balance outstanding (in dollars per share) | $ / shares $ 119.71
Granted (in dollars per share) | $ / shares 135.14
Vested (in dollars per share) | $ / shares 119.52
Canceled (in dollars per share) | $ / shares 128.58
Awards transferred to Amentum in the Separation Transaction (in dollars per share) | $ / shares 135.07
Adjustment to Jacobs awards related to the Separation Transaction (in dollars per share) | $ / shares 0
Ending balance outstanding (in dollars per share) | $ / shares $ 104.73