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Earnings Per Share and Certain Related Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 21, 2019
Jul. 23, 2015
Sep. 27, 2019
Jun. 28, 2019
Mar. 29, 2019
Dec. 28, 2018
Sep. 28, 2018
Jun. 29, 2018
Mar. 30, 2018
Dec. 29, 2017
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Feb. 19, 2019
Jan. 17, 2019
Numerator for Basic and Diluted EPS:                              
Net earnings (loss) attributable to Jacobs from continuing operations     $ 21,946,000 $ 89,365,000 $ 114,755,000 $ 64,894,000 $ (76,997,000) $ 113,336,000 $ (6,290,000) $ (34,234,000) $ 290,960,000 $ (4,185,000) $ 170,167,000    
Net earnings (loss) from continuing operations allocated to participating securities                     (415,000) 0 (1,783,000)    
Net earnings (loss) from continuing operations allocated to common stock for EPS calculation                     290,545,000 (4,185,000) 168,384,000    
Net earnings (loss) attributable to Jacobs from discontinued operations                     557,019,000 167,616,000 123,560,000    
Net earnings (loss) from discontinued operations allocated to participating securities                     (795,000) (808,000) (1,294,000)    
Net earnings (loss) from discontinued operations allocated to common stock for EPS calculation                     556,224,000 166,808,000 122,266,000    
Net earnings allocated to common stock for EPS calculation                     $ 846,769,000 $ 162,623,000 $ 290,650,000    
Denominator for Basic and Diluted EPS:                              
Weighted average basic shares (in shares)                     138,104,000 138,182,000 120,689,000    
Shares allocated to participating securities (in shares)                     (197,000) (646,000) (1,319,000)    
Shares used for calculating basic EPS attributable to common stock (in shares)                     137,907,000 137,536,000 119,370,000    
Effect of dilutive securities:                              
Stock compensation plans (in shares)                     1,299,000 0 777,000    
Shares used for calculating diluted EPS attributable to common stock (in shares)                     139,206,000 137,536,000 120,147,000    
Earnings Per Share, Basic [Abstract]                              
Basic Net Earnings (Loss) from Continuing Operations Per Share (in dollars per share)     $ 0.16 $ 0.65 $ 0.83 $ 0.45 $ (0.54) $ 0.79 $ (0.04) $ (0.27) $ 2.11 $ (0.03) $ 1.41    
Basic Net Earnings from Discontinued Operations Per Share (in dollars per share)     0.89 3.18 (0.42) 0.42 0.28 0.26 0.39 0.29 4.03 1.21 1.02    
Basic EPS (in dollars per share)     1.06 3.83 0.41 0.87 (0.26) 1.05 0.34 0.02 6.14 1.18 2.43    
Earnings Per Share, Diluted [Abstract]                              
Diluted Net Earnings (Loss) from Continuing Operations Per Share (in dollars per share)     0.16 0.65 0.82 0.45 (0.54) 0.79 (0.04) (0.27) 2.09 (0.03) 1.40    
Diluted Net Earnings from Discontinued Operations Per Share (in dollars per share)     0.88 3.15 (0.41) 0.41 0.28 0.26 0.39 0.29 4.00 1.21 1.02    
Diluted EPS (in dollars per share)     $ 1.04 $ 3.80 $ 0.41 $ 0.86 $ (0.26) $ 1.05 $ 0.34 $ 0.02 $ 6.08 $ 1.18 $ 2.42    
Antidilutive securities excluded from computation of ESP (in shares)                       1,176      
Share Repurchases                              
Amount authorized to be repurchased $ 1,000,000,000 $ 500,000,000                         $ 1,000,000,000.0
Accelerated share repurchases, payment $ 250,000,000                         $ 250,000,000  
Remaining authorized repurchase amount                           $ 393,700,000  
Average price per share (in dollars per share) $ 86.43 $ 61.74                          
Number of shares repurchased (in shares) 7,014,633,000 4,005,007,000