Derivative Instruments and Hedging Activities (Pretax Amounts Recognized in Accumulated Other Comprehensive Income on Currency Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net (gain) loss reclassified into revenue	$ (655)	$ (516)	$ (2,136)	$ 274
Net gain (loss) recognized in OCI	(1,074)	2,089	(2,882)	3,359
Currency exchange contracts gain (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning unrealized net gain (loss) in AOCI	192	(1,092)	672	(443)
Net (gain) loss reclassified into revenue	(142)	(273)	(743)	1,031
Net gain (loss) recognized in OCI	(46)	1,967	75	14
Ending unrealized net gain (loss) in AOCI	4	602	4	602
Interest rate swap
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning unrealized net gain (loss) in AOCI	3,684	6,925	7,411	3,499
Net (gain) loss reclassified into revenue	(695)	(422)	(1,988)	(661)
Net gain (loss) recognized in OCI	(1,325)	851	(3,759)	4,516
Ending unrealized net gain (loss) in AOCI	$ 1,664	$ 7,354	$ 1,664	$ 7,354