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. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net (gain) loss reclassified into revenue	$ (567)	$ 687	$ (1,481)	$ 790
Net gain (loss) recognized in OCI	(392)	240	(1,808)	1,270
Currency exchange contracts gain (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning unrealized net gain (loss) in AOCI	214	(444)	672	(443)
Net (gain) loss reclassified into revenue	(16)	1,146	(601)	1,304
Net gain (loss) recognized in OCI	(6)	(1,794)	121	(1,953)
Ending unrealized net gain (loss) in AOCI	192	(1,092)	192	(1,092)
Interest rate swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning unrealized net gain (loss) in AOCI	4,889	5,027	7,411	3,499
Net (gain) loss reclassified into revenue	(709)	(220)	(1,293)	(239)
Net gain (loss) recognized in OCI	(496)	2,118	(2,434)	3,665
Ending unrealized net gain (loss) in AOCI	$ 3,684	$ 6,925	$ 3,684	$ 6,925