CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 29, 2024	Mar. 31, 2023	Mar. 29, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Earnings of the Group	$ 173,534	$ 233,178	$ 354,989	$ 379,849
Other Comprehensive Income:
Foreign currency translation adjustment	(34,872)	21,951	73,177	187,285
Change in cash flow hedges	1,925	(19,811)	(25,741)	(29,955)
Change in pension plan liabilities	4,294	6	(6,459)	(22,259)
Other comprehensive (loss) income before taxes	(28,653)	2,146	40,977	135,071
Income Tax (Expense) Benefit:
Foreign currency translation adjustment	0	968	0	(5,641)
Cash flow hedges	(526)	5,047	6,669	8,317
Change in pension plan liabilities	(473)	(351)	(935)	(659)
Income Tax (Expense) Benefit:	(999)	5,664	5,734	2,017
Net other comprehensive (loss) income	(29,652)	7,810	46,711	137,088
Net Comprehensive Income of the Group	143,882	240,988	401,700	516,937
Net Earnings Attributable to Noncontrolling Interests	(7,340)	(7,803)	(14,567)	(14,834)
Net Earnings Attributable to Redeemable Noncontrolling interests	(4,082)	(8,863)	(6,700)	(12,855)
Net Comprehensive Income Attributable to Jacobs	$ 132,460	$ 224,322	$ 380,433	$ 489,248