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Earnings Per Share and Certain Related Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2022
Oct. 01, 2021
Oct. 02, 2020
Numerator for Basic and Diluted EPS:      
Net earnings attributable to Jacobs from continuing operations $ 644,071 $ 467,022 $ 353,861
Preferred Redeemable Noncontrolling interests redemption value adjustment (See Note 14- PA Consulting Business Combination) 0 57,307 0
Net earnings from continuing operations allocated to participating securities 0 0 (72)
Net earnings from continuing operations allocated to common stock for EPS calculation 644,071 409,715 353,789
Net earnings attributable to Jacobs from discontinued operations (32) 10,008 137,984
Net earnings from discontinued operations allocated to participating securities 0 0 (28)
Net earnings from discontinued operations allocated to common stock for EPS calculation (32) 10,008 137,956
Net earnings allocated to common stock for EPS calculation $ 644,039 $ 419,723 $ 491,745
Denominator for Basic and Diluted EPS:      
Weighted average basic shares (in shares) 128,665 130,194 131,541
Shares allocated to participating securities (in shares) 0 0 (27)
Shares used for calculating basic EPS attributable to common stock (in shares) 128,665 130,194 131,514
Effect of dilutive securities:      
Stock compensation plans (in shares) 780 1,080 1,207
Shares used for calculating diluted EPS attributable to common stock (in shares) 129,445 131,274 132,721
Earnings Per Share, Basic [Abstract]      
Basic Net Earnings from Continuing Operations Per Share (in dollars per share) $ 5.01 $ 3.15 $ 2.69
Basic Net Earnings from Discontinued Operations Per Share (in dollars per share) 0 0.08 1.05
Basic Earnings Per Share (in dollars per share) 5.01 3.22 3.74
Earnings Per Share, Diluted [Abstract]      
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share) 4.98 3.12 2.67
Diluted Net Earnings from Discontinued Operations Per Share (in dollars per share) 0 0.08 1.04
Diluted Earnings Per Share (in dollars per share) 4.98 3.20 $ 3.71
Share Repurchases      
Common stock, par value (in dollars per share) 1 1  
Preferred stock, par value (in dollars per share) $ 1.00 $ 1