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Earnings Per Share and Certain Related Information - Schedule of EPS to Denominator (Details) - USD ($)
 1 Months Ended 3 Months Ended
Jul. 23, 2015
Dec. 28, 2018
Dec. 29, 2017
Earnings Per Share Reconciliation [Abstract]      
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent   $ 64,894,000 $ (34,234,000)
Numerator for Basic and Diluted EPS:      
Net earnings attributable to Jacobs from continuing operations   124,296,000 2,163,000
Undistributed Continuing Operation Earnings (Loss), Basic   (135,000) 243,000
Undistributed Earnings (Loss) from Continuing Operations Available to Common Shareholders, Basic   64,759,000 (33,991,000)
Net Income (Loss) Attributable to Noncontrolling Interest   5,295,000 398,000
Net Earnings Attributable to Jacobs from Continuing Operations   59,402,000 36,397,000
Undistributed Discontinued Operation Earnings (Loss), Basic   (124,000) (258,000)
Undistributed Earnings (Loss) from Discontinued Operations Available to Common Shareholders, Basic   59,278,000 36,139,000
Undistributed Earnings (Loss) Available to Common Shareholders, Basic   $ 124,037,000 $ 2,148,000
Denominator for Basic and Diluted EPS:      
Weighted average basic shares (in shares)   142,451,000 125,008,000
Shares allocated to participating securities (in shares)   (297,000) (886,000)
Shares used for calculating basic EPS attributable to common stock (in shares)   142,154,000 124,122,000
Effect of dilutive securities:      
Stock compensation plans (in shares)   1,424,000 1,023,000
Shares used for calculating diluted EPS attributable to common stock (in shares)   143,578,000 125,145,000
Earnings Per Share, Basic [Abstract]      
Basic Net Earnings from Continuing Operations Per Share (in dollars per share)   $ 0.45 $ (0.27)
Basic Net Earnings from Discontinued Operations Per Share (in dollars per share)   0.42 0.29
Basic Earnings Per Share (in dollars per share)   0.87 0.02
Earnings Per Share, Diluted [Abstract]      
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share)   0.45 (0.27)
Diluted Net Earnings from Discontinued Operations Per Share (in dollars per share)   0.41 0.29
Diluted Earnings Per Share (in dollars per share)   $ 0.86 $ 0.02
Share Repurchases      
Amount authorized to be repurchased $ 500,000,000.0    
Average cost per share repurchased (in dollars per share) $ 60.95    
Number of shares repurchased (in shares) 2,324,161