Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 01, 2018	Apr. 02, 2017	Apr. 01, 2018	Apr. 02, 2017
Reclassifications out of accumulated other comprehensive loss
Balance at the beginning of the period			$ 928,453
Other comprehensive income (loss) before reclassifications	$ (16,252)	$ 10,012	(19,635)	$ (4,832)
Amounts reclassified from accumulated other comprehensive income	109	(237)	91	(579)
Net current-period other comprehensive income (loss)	(16,143)	9,775	(19,544)	(5,411)
Balance at the end of the period	940,046		940,046
Foreign Currency Translation Adjustments
Reclassifications out of accumulated other comprehensive loss
Balance at the beginning of the period	(102,413)	(143,026)	(98,946)	(126,844)
Other comprehensive income (loss) before reclassifications	(16,116)	9,323	(19,583)	(6,859)
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Net current-period other comprehensive income (loss)	(16,116)	9,323	(19,583)	(6,859)
Balance at the end of the period	(118,529)	(133,703)	(118,529)	(133,703)
Gain (Loss) on Derivative Instruments
Reclassifications out of accumulated other comprehensive loss
Balance at the beginning of the period	512	(168)	446	(1,164)
Other comprehensive income (loss) before reclassifications	(136)	689	(52)	2,027
Amounts reclassified from accumulated other comprehensive income	109	(237)	91	(579)
Net current-period other comprehensive income (loss)	(27)	452	39	1,448
Balance at the end of the period	485	284	485	284
Accumulated Other Comprehensive Loss
Reclassifications out of accumulated other comprehensive loss
Balance at the beginning of the period	(101,901)	(143,194)	(98,500)	(128,008)
Balance at the end of the period	$ (118,044)	$ (133,419)	$ (118,044)	$ (133,419)