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Revenue Accounting for Contracts and Adoption of ASC Topic 606 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		9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 3,169,622	$ 2,933,623	$ 9,345,005	$ 7,587,916
Direct cost of contracts	(2,543,488)	(2,325,028)	(7,533,511)	(6,035,598)
Gross Profit	626,134	608,595	1,811,494	1,552,318
Total Segment Operating Profit	89,954	162,512	305,763	226,596
Earnings from Operations Before Taxes	93,399	146,633	297,419	188,580
Income tax expense for Continuing Operations	1,981	(31,174)	(12,829)	(110,230)
Net Earnings of the Group	95,380	115,459	284,590	78,350
Net Earnings of the Group from Discontinued Operations	435,684	34,612	438,837	126,215
Net Earnings of the Group	531,064	150,071	723,427	204,565
Net Earnings Attributable to Jacobs from Continuing Operations	89,365	113,336	269,012	72,811
Net Earnings Attributable to Jacobs from Discontinued Operations	435,077	36,886	436,642	128,161
Net Earnings Attributable to Jacobs	524,442	$ 150,222	705,654	$ 200,972
Continuing Operations
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	3,169,622		9,345,005
Direct cost of contracts	(2,543,488)		(7,533,511)
Gross Profit	626,134		1,811,494
Total Segment Operating Profit	89,954		305,763
Earnings from Operations Before Taxes	93,399		297,419
Income tax expense for Continuing Operations	1,981		(12,829)
Net Earnings of the Group	95,380		284,590
Net Earnings of the Group from Discontinued Operations	435,684		438,837
Net Earnings of the Group	531,064		723,427
Net Earnings Attributable to Jacobs from Continuing Operations	89,365		269,012
Net Earnings Attributable to Jacobs	524,442		705,654
Continuing Operations | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	2,755		16,786
Direct cost of contracts	0		0
Gross Profit	2,755		16,786
Total Segment Operating Profit	2,755		16,786
Earnings from Operations Before Taxes	2,755		16,786
Income tax expense for Continuing Operations	(850)		(3,321)
Net Earnings of the Group	1,905		13,465
Net Earnings of the Group from Discontinued Operations	1,242		4,750
Net Earnings of the Group	3,147		18,215
Net Earnings Attributable to Jacobs from Continuing Operations	1,905		13,465
Net Earnings Attributable to Jacobs	3,147		18,215
Continuing Operations | Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	3,166,867		9,328,219
Direct cost of contracts	(2,543,488)		(7,533,511)
Gross Profit	623,379		1,794,708
Total Segment Operating Profit	87,199		288,977
Earnings from Operations Before Taxes	90,644		280,633
Income tax expense for Continuing Operations	2,831		(9,508)
Net Earnings of the Group	93,475		271,125
Net Earnings of the Group from Discontinued Operations	434,442		434,087
Net Earnings of the Group	527,917		705,212
Net Earnings Attributable to Jacobs from Continuing Operations	87,460		255,547
Net Earnings Attributable to Jacobs	521,295		687,439
Discontinued Operations
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Earnings Attributable to Jacobs from Discontinued Operations	435,077		436,642
Discontinued Operations | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Earnings Attributable to Jacobs from Discontinued Operations	1,242		4,750
Discontinued Operations | Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Earnings Attributable to Jacobs from Discontinued Operations	$ 433,835		$ 431,892

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