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Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Statement of Comprehensive Income [Abstract]
Net Earnings of the Group	$ 263,267	$ 129,591
Other Comprehensive Income (Loss):
Foreign currency translation adjustments	52,297	(52,400)
Gain (loss) on cash flow hedges	18	1,790
Change in pension and retiree medical plan liabilities	(16,251)	1,825
Other comprehensive income (loss) before taxes	36,064	(48,785)
Income Tax (Expense) Benefit:
Cash flow hedges	0	(543)
Change in pension and retiree medical plan liabilities	582	(521)
Income Tax (Expense) Benefit:	582	(1,064)
Net other comprehensive income (loss)	36,646	(49,849)
Net Comprehensive Income (Loss) of the Group	299,913	79,742
Net (Earnings) Loss Attributable to Noncontrolling Interests	(6,257)	(5,295)
Net Comprehensive Income (Loss) Attributable to Jacobs	$ 293,656	$ 74,447

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