Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 01, 2022	Apr. 02, 2021	Apr. 01, 2022	Apr. 02, 2021
Income Statement [Abstract]
Revenues	$ 3,834,059	$ 3,547,873	$ 7,214,684	$ 6,929,708
Direct cost of contracts	(2,963,649)	(2,780,860)	(5,547,800)	(5,530,636)
Gross profit	870,410	767,013	1,666,884	1,399,072
Selling, general and administrative expenses	(704,195)	(808,125)	(1,323,336)	(1,226,246)
Operating Profit (Loss)	166,215	(41,112)	343,548	172,826
Other Income (Expense):
Interest income	381	608	1,882	1,732
Interest expense	(21,995)	(15,464)	(41,421)	(32,777)
Miscellaneous income (expense), net	10,681	(56,313)	20,362	100,047
Total other (expense) income, net	(10,933)	(71,169)	(19,177)	69,002
Earnings (Loss) from Continuing Operations Before Taxes	155,282	(112,281)	324,371	241,828
Income Tax (Expense) Benefit from Continuing Operations	(46,166)	20,772	(62,054)	(66,250)
Net Earnings (Loss) of the Group from Continuing Operations	109,116	(91,509)	262,317	175,578
Net (Loss) Earnings of the Group from Discontinued Operations	(1)	11,320	(233)	11,305
Net Earnings (Loss) of the Group	109,115	(80,189)	262,084	186,883
Net Earnings Attributable to Noncontrolling Interests from Continuing Operations	(10,261)	(10,158)	(19,514)	(20,184)
Net (Earnings) Loss Attributable to Redeemable Noncontrolling interests	(10,038)	101,392	(19,721)	101,392
Net Earnings (Loss) Attributable to Jacobs from Continuing Operations	88,817	(275)	223,082	256,786
Net Earnings Attributable to Jacobs	$ 88,816	$ 11,045	$ 222,849	$ 268,091
Net Earnings Per Share:
Basic Net Earnings from Continuing Operations Per Share (in dollars per share)	$ 0.69	$ 0	$ 1.72	$ 1.97
Basic Net Earnings from Discontinued Operations Per Share (in dollars per share)	0	0.09	0	0.09
Basic Earnings Per Share (in dollars per share)	0.69	0.08	1.72	2.06
Diluted Net Earnings from Continuing Operations Per Share (in dollars per share)	0.68	0	1.71	1.96
Diluted Net Earnings from Discontinued Operations Per Share (in dollars per share)	0	0.09	0	0.09
Diluted Earnings Per Share (in dollars per share)	$ 0.68	$ 0.08	$ 1.71	$ 2.04