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Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Income Statement [Abstract]
Revenues	$ 4,142,644	$ 4,156,663	$ 3,935,028	$ 2,750,311	$ 2,653,866	$ 2,514,751	$ 2,302,567	$ 2,551,604	$ 2,640,587	$ 2,693,873	$ 2,781,763	$ 2,847,934	$ 14,984,646	$ 10,022,788	$ 10,964,157
Direct cost of contracts													(12,156,276)	(8,250,536)	(9,196,326)
Gross profit													2,828,370	1,772,252	1,767,831
Selling, general and administrative expenses													(2,180,399)	(1,379,983)	(1,429,233)
Operating Profit	241,312	212,729	146,286	47,644	106,993	128,475	68,173	88,628	82,811	109,556	86,781	59,450	647,971	392,269	338,598
Other Income (Expense):
Interest income													8,984	8,748	7,848
Interest expense													(76,760)	(12,035)	(15,260)
Gain (Loss) on disposal of business and investments													(20,967)	10,880	(41,410)
Miscellaneous income (expense), net													(4,523)	(6,645)	(3,053)
Total other (expense) income, net													(93,266)	948	(51,875)
Earnings Before Taxes													554,705	393,217	286,723
Income Tax Expense													(381,563)	(105,842)	(72,208)
Net Earnings of the Group	(31,422)	150,071	51,932	2,561	93,428	88,629	44,165	61,153	29,883	70,937	63,389	50,306	173,142	287,375	214,515
Net (Earnings) Loss Attributable to Noncontrolling Interests													(9,711)	6,352	(4,052)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	5,944,354				4,487,351				4,330,182				5,944,354	4,487,351	4,330,182	$ 4,356,458
Net Earnings Attributable to Jacobs	$ (37,541)	$ 150,222	$ 48,587	$ 2,163	$ 94,141	$ 89,032	$ 50,018	$ 60,536	$ 29,644	$ 69,055	$ 65,250	$ 46,514	$ 163,431	$ 293,727	$ 210,463
Net Earnings Per Share:
Basic (in dollars per share)	$ (0.26)	$ 1.05	$ 0.34	$ 0.02	$ 0.78	$ 0.74	$ 0.41	$ 0.50	$ 0.25	$ 0.58	$ 0.54	$ 0.38	$ 1.18	$ 2.43	$ 1.75
Diluted (in dollars per share)	$ (0.26)	$ 1.05	$ 0.34	$ 0.02	$ 0.78	$ 0.74	$ 0.41	$ 0.50	$ 0.24	$ 0.57	$ 0.54	$ 0.38	$ 1.17	$ 2.42	$ 1.73

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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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