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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Statement of Comprehensive Income [Abstract]
Net Earnings of the Group	$ 873,219	$ 173,142	$ 287,375
Other Comprehensive Income (Loss):
Foreign currency translation adjustment	15,972	(109,877)	(140,527)
Gain (loss) on cash flow hedges	1,369	118	(1,350)
Change in pension and retiree medical plan liabilities	(157,632)	(27,231)	123,427
Other comprehensive income (loss) before taxes	(140,291)	(136,990)	(18,450)
Income Tax (Expense) Benefit:
Cash flow hedges	(568)	859	(90)
Change in pension and retiree medical plan liabilities	30,750	(17,058)	(24,380)
Income Tax (Expense) Benefit:	30,182	(16,199)	(24,470)
Net other comprehensive income (loss)	(110,109)	(153,189)	(42,920)
Net Comprehensive Income (Loss) of the Group	763,110	19,953	244,455
Net (Earnings) Loss Attributable to Noncontrolling Interests	(25,240)	(9,711)	6,352
Net Comprehensive Income (Loss) Attributable to Jacobs	$ 737,870	$ 10,242	$ 250,807

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