Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)	6 Months Ended
	Mar. 30, 2019	Sep. 29, 2018
Derivative [Line Items]
Gross notional amount of foreign exchange derivatives outstanding	$ 26,576,000	$ 39,856,000
Net notional amount of foreign exchange derivatives	24,840,000	29,315,000
Gain (loss) projected to be reclassified from Accumulated Other Comprehensive Income into earnings, within twelve months	$ 193,000
Maximum remaining maturity of any forward or optional contract derivatives (in years)	1 year 7 months 15 days
Cash flow derivatives
Derivative [Line Items]
Foreign currency exchange contract asset (liability), net value	$ 236,000	816,000
Foreign currency exchange contract, net asset market value	314,000	989,000
Foreign currency exchange contract, net liability market value	78,000	173,000
Interest rate swaps
Derivative [Line Items]
Gain (loss) projected to be reclassified from Accumulated Other Comprehensive Income into earnings, within twelve months	2,378,000
Notional amount	$ 225,000,000
Fixed interest rate	1.256%
Interest rate swaps	$ 3,684,000	7,411,000
Foreign exchange balance sheet derivative contracts
Derivative [Line Items]
Gross notional amount of foreign exchange derivatives outstanding	108,957,000	90,816,000
Net notional amount of foreign exchange derivatives	34,789,000	28,271,000
Foreign currency exchange contract asset (liability), net value	$ 97,000	$ 91,000