Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Mar. 29, 2020	Mar. 31, 2019
Reclassifications out of accumulated other comprehensive loss
Beginning balance	$ 1,026,765	$ 954,301	$ 989,464	$ 967,100
Amounts reclassified from accumulated other comprehensive loss:
Net current-period other comprehensive loss	(54,380)	6,477	(38,809)	(20,629)
Ending balance	950,238	990,605	950,238	990,605
Foreign Currency Translation Adjustments
Reclassifications out of accumulated other comprehensive loss
Beginning balance	(135,812)	(151,936)	(149,711)	(128,602)
Other comprehensive income (loss) before reclassifications	(47,011)	9,245	(33,112)	(14,089)
Amounts reclassified from accumulated other comprehensive loss:
Interest rate contracts, net of tax	0	0	0	0
Net current-period other comprehensive loss	(47,011)	9,245	(33,112)	(14,089)
Ending balance	(182,823)	(142,691)	(182,823)	(142,691)
Loss on Derivative Instruments
Reclassifications out of accumulated other comprehensive loss
Beginning balance	(9,203)	(2,757)	(10,873)	1,252
Other comprehensive income (loss) before reclassifications		(2,504)		(6,287)
Amounts reclassified from accumulated other comprehensive loss:
Net current-period other comprehensive loss		(2,769)		(6,778)
Ending balance		(5,526)		(5,526)
Loss on Derivative Instruments | Interest rate swap agreements
Amounts reclassified from accumulated other comprehensive loss:
Interest rate contracts, net of tax		(265)		(491)
Loss on Derivative Instruments
Reclassifications out of accumulated other comprehensive loss
Other comprehensive income (loss) before reclassifications	(6,727)		(4,574)
Amounts reclassified from accumulated other comprehensive loss:
Net current-period other comprehensive loss	(7,365)		(5,695)
Ending balance	(16,568)		(16,568)
Loss on Derivative Instruments | Interest rate swap agreements
Amounts reclassified from accumulated other comprehensive loss:
Interest rate contracts, net of tax	(638)		(1,121)
Accumulated Other Comprehensive Loss
Reclassifications out of accumulated other comprehensive loss
Beginning balance	(145,015)	(154,693)	(160,584)	(127,350)
Other comprehensive income (loss) before reclassifications	(53,738)	6,741	(37,686)	(20,376)
Amounts reclassified from accumulated other comprehensive loss:
Interest rate contracts, net of tax	(638)	(265)	(1,121)	(491)
Net current-period other comprehensive loss	(54,376)	6,476	(38,807)	(20,867)
Ending balance	$ (199,391)	$ (148,217)	$ (199,391)	$ (148,217)