CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Total Jacobs Stockholders’ Equity	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance at Sep. 29, 2023	$ 6,600,082	$ 6,546,220	$ 125,977	$ 2,735,325	$ 4,542,872	$ (857,954)	$ 53,862
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	503,774	480,657			480,657		23,117
Foreign currency translation adjustments, net of deferred taxes of $(4,558)	78,985	78,985				78,985
Pension plan liability, net of deferred taxes	(5,621)	(5,621)				(5,621)
Change in cash flow hedges, net of deferred taxes	(21,825)	(21,825)				(21,825)
Dividends	(73,638)	(73,638)			(73,638)
Redeemable Noncontrolling interests redemption value adjustment	(99,358)	(99,358)			(99,358)
Repurchase and issuance of redeemable noncontrolling interests	1,560	1,560			1,560
Noncontrolling interests - distributions and other	(17,342)						(17,342)
Stock based compensation	54,170	54,170		54,170
Issuances of equity securities including shares withheld for taxes	2,025	2,025	779	6,742	(5,496)
Repurchases of equity securities	(346,382)	(346,382)	(2,502)	(54,487)	(289,393)
Ending balance at Jun. 28, 2024	6,676,430	6,616,793	124,254	2,741,750	4,557,204	(806,415)	59,637
Beginning balance at Mar. 29, 2024	6,678,462	6,624,114	125,216	2,733,758	4,576,383	(811,243)	54,348
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	155,485	146,934			146,934		8,551
Foreign currency translation adjustments, net of deferred taxes of $(4,558)	5,808	5,808				5,808
Pension plan liability, net of deferred taxes	1,775	1,775				1,775
Change in cash flow hedges, net of deferred taxes	(2,755)	(2,755)				(2,755)
Dividends	(36,561)	(36,561)			(36,561)
Redeemable Noncontrolling interests redemption value adjustment	(2,796)	(2,796)			(2,796)
Repurchase and issuance of redeemable noncontrolling interests	(338)	(338)			(338)
Noncontrolling interests - distributions and other	(3,262)						(3,262)
Stock based compensation	18,994	18,994		18,994
Issuances of equity securities including shares withheld for taxes	12,537	12,537	111	12,463	(37)
Repurchases of equity securities	(150,919)	(150,919)	(1,073)	(23,465)	(126,381)
Ending balance at Jun. 28, 2024	6,676,430	6,616,793	124,254	2,741,750	4,557,204	(806,415)	59,637
Beginning balance at Sep. 27, 2024	4,567,303	4,549,467	124,084	2,758,064	2,366,769	(699,450)	17,836
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	165,877	167,086			167,086		(1,209)
Foreign currency translation adjustments, net of deferred taxes of $(4,558)	45,279	45,279				45,279
Pension plan liability, net of deferred taxes	(811)	(811)				(811)
Change in cash flow hedges, net of deferred taxes	(2,658)	(2,658)				(2,658)
Dividends	(79,625)	(79,625)			(79,625)
Dividend in kind	(159,266)	(159,266)			(159,266)
Redeemable Noncontrolling interests redemption value adjustment	(68,031)	(68,031)			(68,031)
Repurchase and issuance of redeemable noncontrolling interests	2,531	2,531			2,531
Noncontrolling interests - distributions and other	(7,398)						(7,398)
Distribution adjustments relating to SpinCo Business	(24,600)	(24,600)			(24,600)
Stock based compensation	47,421	47,421		47,421
Issuances of equity securities including shares withheld for taxes	(1,525)	(1,525)	612	5,455	(7,592)
Repurchases of equity securities	(653,247)	(653,247)	(4,991)	(111,170)	(537,086)
Ending balance at Jun. 27, 2025	3,831,250	3,822,021	119,705	2,699,770	1,660,186	(657,640)	9,229
Beginning balance at Mar. 28, 2025	3,873,160	3,864,444	120,379	2,699,690	1,824,418	(780,043)	8,716
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	184,047	179,605			179,605		4,442
Foreign currency translation adjustments, net of deferred taxes of $(4,558)	141,387	141,387				141,387
Pension plan liability, net of deferred taxes	(16,483)	(16,483)				(16,483)
Change in cash flow hedges, net of deferred taxes	(2,501)	(2,501)				(2,501)
Dividends	(39,731)	(39,731)			(39,731)
Dividend in kind	(159,266)	(159,266)			(159,266)
Redeemable Noncontrolling interests redemption value adjustment	(59,540)	(59,540)			(59,540)
Repurchase and issuance of redeemable noncontrolling interests	1,450	1,450			1,450
Noncontrolling interests - distributions and other	(3,929)						(3,929)
Distribution adjustments relating to SpinCo Business	(1,955)	(1,955)			(1,955)
Stock based compensation	13,079	13,079		13,079
Issuances of equity securities including shares withheld for taxes	2,377	2,377	136	5,186	(2,945)
Repurchases of equity securities	(100,845)	(100,845)	(810)	(18,185)	(81,850)
Ending balance at Jun. 27, 2025	$ 3,831,250	$ 3,822,021	$ 119,705	$ 2,699,770	$ 1,660,186	$ (657,640)	$ 9,229