Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Derivative [Line Items]
Gross notional amount of foreign exchange derivatives outstanding	$ 39,856	$ 29,136
Net notional amount of foreign exchange derivatives	29,315	24,093
Recognized in earnings as a result of the ineffectiveness of cash flow hedges	5	8	$ 1
Cash flow hedge gain (loss) to be reclassified within twelve months	$ 618
Maximum remaining maturity of foreign currency derivatives	1 year 5 months
Cash Flow Hedging [Member]
Derivative [Line Items]
Foreign currency exchange contract, net value	$ 816	(478)
Net market value of the foreign currency exchange contracts, assets	989	73
Net market value of the foreign currency exchange contracts, liabilities	173	551
Interest Rate Swap [Member]
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months	2,927
Notional amount	$ 255,000
Fixed interest rate	1.256%
Interest rate swaps	$ 7,411	3,499
Foreign Exchange Balance Sheet Derivative Contracts [Member]
Derivative [Line Items]
Gross notional amount of foreign exchange derivatives outstanding	90,816	52,208
Net notional amount of foreign exchange derivatives	28,271	14,762
Foreign currency exchange contract, net value	$ 91	$ 77