Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 13,877	$ (9,141)
Other comprehensive income (loss), net of tax:
Unrealized hedge gain (loss) arising during the period, net of tax of $0.1 million and $0.4 million in the first quarter of 2018 and 2017, respectively	(913)	3,037
Net hedge (gain) loss reclassified into earnings, net of tax of $0.1 million and $0.1 million in the first quarter of 2018 and 2017, respectively	573	(356)
Unrealized gain (loss) on hedging instruments	(340)	2,681
Foreign currency translation adjustment, net of tax of $0 for each period	5,229	(18,652)
Unrealized loss on marketable securities, net of tax of $0 for each period	(179)	(139)
Amortization of net actuarial pension loss included in net income, net of tax of $0.2 million and $0.2 million in the first quarter of 2018 and 2017, respectively	371	516
Change in unamortized pension loss during the period related to changes in foreign currency	(263)	1,690
Other comprehensive income (loss)	4,818	(13,904)
Comprehensive income (loss)	$ 18,695	$ (23,045)