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Earnings Per Share and Certain Related Information - Schedule of EPS to Denominator (Details) - USD ($)		3 Months Ended
	Jan. 17, 2019	Dec. 27, 2019	Dec. 28, 2018	Dec. 04, 2019	Jun. 05, 2019	Feb. 19, 2019
Numerator for Basic and Diluted EPS:
Net earnings (loss) attributable to Jacobs from continuing operations		$ 179,423,000	$ 64,894,000
Undistributed Continuing Operation Earnings (Loss), Basic		(92,000)	(135,000)
Undistributed Earnings (Loss) from Continuing Operations Available to Common Shareholders, Basic		179,331,000	64,759,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent		77,587,000	59,402,000
Undistributed Discontinued Operation Earnings (Loss), Basic		(40,000)	(124,000)
Undistributed Earnings (Loss) from Discontinued Operations Available to Common Shareholders, Basic		77,547,000	59,278,000
Undistributed Earnings (Loss) Available to Common Shareholders, Basic		$ 256,878,000	$ 124,037,000
Denominator for Basic and Diluted EPS:
Weighted average basic shares (in shares)		133,202,000	142,451,000
Shares allocated to participating securities (in shares)		(68,000)	(297,000)
Shares used for calculating basic EPS attributable to common stock (in shares)		133,134,000	142,154,000
Effect of dilutive securities:
Stock compensation plans (in shares)		1,484,000	1,424,000
Shares used for calculating diluted EPS attributable to common stock (in shares)		134,618,000	143,578,000
Earnings Per Share, Basic [Abstract]
Basic Net Earnings from Continuing Operations Per Share (in dollars per share)		$ 1.35	$ 0.45
Basic Net Earnings from Discontinued Operations Per Share (in dollars per share)		0.58	0.42
Basic Earnings Per Share (in dollars per share)		1.93	0.87
Earnings Per Share, Diluted [Abstract]
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share)		1.33	0.45
Diluted Net Earnings from Discontinued Operations Per Share (in dollars per share)		0.58	0.41
Diluted Earnings Per Share (in dollars per share)		$ 1.91	$ 0.86
Share Repurchases [Abstract]
Share repurchases				$ 250,000,000	$ 250,000,000	$ 500,000,000
Amount authorized to be repurchased	$ 1,000,000,000
Average cost per share repurchased (in dollars per share)	$ 91.08
Number of shares repurchased (in shares)	351,486
Number of shares retired (in shares)	351,486

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