Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 8,438	$ 7,199	$ 41,589	$ 8,904
Other comprehensive income (loss), net of tax
Foreign currency translation gain (loss) adjustments	5,172	3,197	7,671	(6,605)
Derivative instruments
Unrealized net gain (loss)	240	(1,017)	1,270	3,141
Net (gain) loss reclassified to earnings	687	62	790	(206)
Defined benefit pension plan
Unrealized net gain (loss)	(641)	198	(271)	326
Net (gain) loss reclassified to earnings	95	167	186	337
Currency exchange rate gain (loss)	(181)	(190)	(268)	507
Other comprehensive income (loss)	5,372	2,417	9,378	(2,500)
Comprehensive income (loss)	$ 13,810	$ 9,616	$ 50,967	$ 6,404