Derivative Instruments (Details) - Cash Flow Hedging [Member]	3 Months Ended		9 Months Ended
	Sep. 26, 2015 USD ($) contract	Sep. 27, 2014 USD ($) contract	Sep. 26, 2015 USD ($) contract	Sep. 27, 2014 USD ($) contract
Derivative [Line Items]
Gains (losses) related to de-designation of discontinued cash flow hedges			$ 0
Forward currency contracts outstanding | contract	79	84	79	84
Forward currency contracts maturity, maximum			15 months
Notional amount of contracts	$ 48,300,000	$ 35,500,000	$ 48,300,000	$ 35,500,000
Aggregate fair value gain, net of taxes	$ 2,700,000	$ 700,000	$ 700,000	$ 200,000