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Revenue Accounting for Contracts and Adoption of ASC Topic 606 Income statement Impact of Adoption of the Amended Revenue Recognition Guidance (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
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
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues $ 3,392,862 $ 3,169,622 $ 3,091,596 $ 3,083,788 $ 2,991,856 $ 2,933,623 $ 2,870,295 $ 1,783,999 $ 12,737,868 $ 10,579,773 $ 6,330,126
Gross profit                 2,477,028 2,158,550 1,260,035
Selling, general and administrative expenses                 (2,072,177) (1,771,107) (1,015,893)
Operating Profit 99,086 89,954 102,681 113,130 160,846 162,512 68,755 (4,670) 404,851 387,443 244,142
Earnings from Continuing Operations Before Taxes 53,537 93,399 111,832 92,191 142,400 146,633 48,651 (6,703) 350,959 330,981 243,154
Income tax expense for Continuing Operations                 (89,344) (69,141) (39,500)
Net Earnings of the Group from Continuing Operations 29,413 95,380 119,779 69,433 (73,002) 115,459 (3,205) (33,903) 314,005 5,349 170,051
Net Earnings of the Group from Discontinued Operations                 559,214 167,793 117,324
Net Earnings of the Group                 873,219 173,142 287,375
Net earnings (loss) attributable to Jacobs from continuing operations 21,946 89,365 114,755 64,894 (76,997) 113,336 (6,290) (34,234) 290,960 (4,185) 170,167
Net Earnings Attributable to Jacobs from Discontinued Operations                 557,019 167,616 123,560
Net earnings attributable to Jacobs from continuing operations $ 142,324 $ 524,442 $ 56,917 $ 124,296 $ (37,541) $ 150,222 $ 48,587 $ 2,163 847,979 $ 163,431 $ 293,727
Continuing Operations                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 12,737,868    
Direct costs of contracts                 (10,260,840)    
Gross profit                 2,477,028    
Selling, general and administrative expenses                 (2,072,177)    
Operating Profit                 404,851    
Earnings from Continuing Operations Before Taxes                 350,959    
Income tax expense for Continuing Operations                 (36,954)    
Net Earnings of the Group from Continuing Operations                 314,005    
Net Earnings of the Group from Discontinued Operations                 559,214    
Net Earnings of the Group                 873,219    
Net earnings (loss) attributable to Jacobs from continuing operations                 290,960    
Net Earnings Attributable to Jacobs from Discontinued Operations                 557,019    
Net earnings attributable to Jacobs from continuing operations                 847,979    
Continuing Operations | Calculated under Revenue Guidance in Effect before Topic 606                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 12,714,710    
Direct costs of contracts                 (10,260,840)    
Gross profit                 2,453,870    
Selling, general and administrative expenses                 (2,072,177)    
Operating Profit                 381,693    
Earnings from Continuing Operations Before Taxes                 327,801    
Income tax expense for Continuing Operations                 (32,308)    
Net Earnings of the Group from Continuing Operations                 295,493    
Net Earnings of the Group from Discontinued Operations                 554,464    
Net Earnings of the Group                 849,957    
Net earnings (loss) attributable to Jacobs from continuing operations                 272,448    
Net Earnings Attributable to Jacobs from Discontinued Operations                 552,269    
Net earnings attributable to Jacobs from continuing operations                 824,717    
Accounting Standards Update 2014-09 | Continuing Operations | Difference between Revenue Guidance in Effect before and after Topic 606                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 23,158    
Direct costs of contracts                 0    
Gross profit                 23,158    
Selling, general and administrative expenses                 0    
Operating Profit                 23,158    
Earnings from Continuing Operations Before Taxes                 23,158    
Income tax expense for Continuing Operations                 (4,646)    
Net Earnings of the Group from Continuing Operations                 18,512    
Net Earnings of the Group from Discontinued Operations                 4,750    
Net Earnings of the Group                 23,262    
Net earnings (loss) attributable to Jacobs from continuing operations                 18,512    
Net Earnings Attributable to Jacobs from Discontinued Operations                 4,750    
Net earnings attributable to Jacobs from continuing operations                 $ 23,262