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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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	$ 30,811	$ 31,785	$ 75,435	$ 36,783
Other comprehensive income:
Foreign currency translation adjustment	2,668	(1,013)	(775)	527
Unrecognized actuarial (loss)/gain, Switzerland pension plan, net of tax	(123)	15	(38)	1
Foreign currency translation and pension plan, net of tax	2,545	(998)	(813)	528
Derivatives designated as hedging instruments:
Unrealized gain/(loss) on derivative instruments, net of tax	542	41	70	(92)
Reclassification adjustment for loss/(gain) on derivative instruments recognized, net of tax	263	(1)	1,269	132
Net decrease from derivatives designated as hedging instruments, net of tax	805	40	1,339	40
Total other comprehensive income/(loss)	3,350	(958)	526	568
Comprehensive income	$ 34,161	$ 30,827	$ 75,961	$ 37,351

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