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Earnings Per Share and Certain Related Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jul. 02, 2021
Oct. 01, 2021
Oct. 02, 2020
Sep. 27, 2019
Numerator for Basic and Diluted EPS:        
Net earnings attributable to Jacobs from continuing operations   $ 467,022 $ 353,861 $ 290,960
Preferred Redeemable Noncontrolling interests redemption value adjustment (See Note 14- PA Consulting Business Combination) $ (57,300) (57,307) 0 0
Net earnings from continuing operations allocated to participating securities   0 (72) (415)
Net earnings from continuing operations allocated to common stock for EPS calculation   409,715 353,789 290,545
Net earnings attributable to Jacobs from discontinued operations   10,008 137,984 557,019
Net earnings from discontinued operations allocated to participating securities   0 (28) (795)
Net earnings from discontinued operations allocated to common stock for EPS calculation   10,008 137,956 556,224
Net earnings allocated to common stock for EPS calculation   $ 419,723 $ 491,745 $ 846,769
Denominator for Basic and Diluted EPS:        
Weighted average basic shares (in shares)   130,194 131,541 138,104
Shares allocated to participating securities (in shares)   0 (27) (197)
Shares used for calculating basic EPS attributable to common stock (in shares)   130,194 131,514 137,907
Effect of dilutive securities:        
Stock compensation plans (in shares)   1,080 1,207 1,299
Shares used for calculating diluted EPS attributable to common stock (in shares)   131,274 132,721 139,206
Earnings Per Share, Basic [Abstract]        
Basic Net Earnings from Continuing Operations Per Share (in dollars per share)   $ 3.15 $ 2.69 $ 2.11
Basic Net Earnings from Discontinued Operations Per Share (in dollars per share)   0.08 1.05 4.03
Basic Earnings Per Share (in dollars per share)   3.22 3.74 6.14
Earnings Per Share, Diluted [Abstract]        
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share)   3.12 2.67 2.09
Diluted Net Earnings from Discontinued Operations Per Share (in dollars per share)   0.08 1.04 4.00
Diluted Earnings Per Share (in dollars per share)   3.20 3.71 $ 6.08
Share Repurchases        
Common stock, par value (in dollars per share)   1 1  
Preferred stock, par value (in dollars per share)   $ 1.00 $ 1