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Earnings Per Share and Certain Related Information - Schedule of Compute Basic and Diluted of EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
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
Numerator for Basic and Diluted EPS:                      
Net earnings attributable to Jacobs from continuing operations $ 309,299 $ 82,926 $ 92,235 $ 128,344 $ 71,407 $ 90,309 $ 140,985 $ 76,424 $ 612,804 $ 379,125 $ 354,164
Redeemable Noncontrolling interests redemption value adjustment (See Note 15- PA Consulting Business Combination)                 (10,274) 8,340 0
Net earnings from continuing operations allocated to common stock for EPS calculation                 602,530 387,465 354,164
Net earnings from discontinued operations allocated to common stock for EPS calculation                 193,289 286,652 289,875
Net earnings allocated to common stock for EPS calculation                 $ 795,819 $ 674,117 $ 644,039
Denominator for Basic and Diluted EPS:                      
Shares used for calculating basic EPS attributable to common stock (in shares)                 125,324 126,607 128,665
Effect of dilutive securities:                      
Stock compensation plans (in shares)                 557 607 780
Shares used for calculating diluted EPS attributable to common stock (in shares)                 125,881 127,214 129,445
Basic Earnings Per Share:                      
Basic Net Earnings from Continuing Operations Per Share (in dollars per share) $ 2.39 $ 0.66 $ 0.73 $ 1.03 $ 0.63 $ 0.71 $ 1.11 $ 0.60 $ 4.81 $ 3.06 $ 2.75
Basic Net Earnings from Discontinued Operations Per Share (in dollars per share) 0.13 0.51 0.56 0.34 0.62 0.58 0.60 0.47 1.54 2.26 2.25
Basic Earnings Per Share (in dollars per share) 2.52 1.17 1.29 1.37 1.25 1.29 1.71 1.07 6.35 5.32 5.01
Diluted Earnings Per Share:                      
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share) 2.38 0.66 0.73 1.03 0.63 0.71 1.11 0.60 4.79 3.05 2.74
Diluted Net Earnings from Discontinued Operations Per Share (in dollars per share) 0.13 0.51 0.55 0.34 0.61 0.58 0.59 0.46 1.54 2.25 2.24
Diluted Earnings Per Share (in dollars per share) $ 2.51 $ 1.17 $ 1.28 $ 1.37 $ 1.24 $ 1.29 $ 1.70 $ 1.06 $ 6.32 $ 5.30 $ 4.98