Derivative Instruments and Hedging Activities (Pretax Amounts Recognized in Accumulated Other Comprehensive Income on Currency Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net (gain) loss reclassified into revenue	$ (426)	$ (567)	$ (676)	$ (1,481)
Net gain (loss) recognized in OCI	936	(392)	822	(1,808)
Currency exchange contracts gain (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning unrealized net gain (loss) in AOCI	397	214	566	672
Net (gain) loss reclassified into revenue	(316)	(16)	(335)	(601)
Net gain (loss) recognized in OCI	267	(6)	117	121
Ending unrealized net gain (loss) in AOCI	348	192	348	192
Interest rate swap
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning unrealized net gain (loss) in AOCI	778	4,889	1,079	7,411
Net (gain) loss reclassified into revenue	(236)	(709)	(537)	(1,293)
Net gain (loss) recognized in OCI	0	(496)	0	(2,434)
Ending unrealized net gain (loss) in AOCI	$ 542	$ 3,684	$ 542	$ 3,684