Consolidated Statements Of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (951)	$ 3,073	$ (11,196)	$ (25,992)
Other comprehensive income (loss), net of tax:
Unrealized hedge gain (loss) arising during the period, net of tax of $0.3 million and $0 million in the third quarter of 2017 and 2016, respectively, and $0 million in the first nine months of 2017 and 2016, respectively	(2,298)	361	224	(3,633)
Net hedge (gain) loss reclassified into earnings, net of tax of $0 in the third quarter of 2017 and 2016, respectively, and $0.1 million and $0 million in the first nine months of 2017 and 2016, respectively	75	1,560	(777)	727
Change in unrealized gain (loss) on hedging instruments	(2,223)	1,921	(553)	(2,906)
Foreign currency translation adjustment, net of tax of $0 for each period	17,553	(5,961)	3,893	(1,219)
Unrealized gain (loss) on marketable securities	21	7	(50)	7
Amortization of net actuarial pension loss included in net income, net of tax of $0.2 million and $0.2 million in the third quarter of 2017 and 2016, respectively, and $0.7 million and $0.5 million in the first nine months of 2017 and 2016, respectively	597	417	1,687	1,220
Change in unamortized pension income (loss) during the period related to changes in foreign currency	(1,721)	413	(343)	82
Total other comprehensive income (loss)	14,227	(3,203)	4,634	(2,816)
Comprehensive income (loss)	$ 13,276	$ (130)	$ (6,562)	$ (28,808)