Foreign Exchange Instruments (Details)	3 Months Ended		9 Months Ended						9 Months Ended
	Sep. 28, 2013 USD ($)	Sep. 29, 2012 USD ($)	Sep. 28, 2013 USD ($)	Sep. 29, 2012 USD ($)	Sep. 28, 2013 Prepaid expenses and other assets USD ($)	Dec. 29, 2012 Prepaid expenses and other assets USD ($)	Sep. 28, 2013 Other accrued liabilities USD ($)	Dec. 29, 2012 Other accrued liabilities USD ($)	Sep. 28, 2013 Not Designated Maximum	Sep. 28, 2013 Not Designated Euro (sell) EUR (€)	Dec. 29, 2012 Not Designated Euro (sell) EUR (€)	Sep. 28, 2013 Not Designated British Pound Sterling (sell) GBP (£)	Dec. 29, 2012 Not Designated British Pound Sterling (sell) GBP (£)	Sep. 28, 2013 Not Designated U.S. Dollar (sell) USD ($)	Dec. 29, 2012 Not Designated U.S. Dollar (sell) USD ($)	Sep. 28, 2013 Not Designated U.S. Dollar (buy) 1 USD ($)	Dec. 29, 2012 Not Designated U.S. Dollar (buy) 1 USD ($)
Foreign currency forward exchange details
Approximate period forward contracts									6 months
Gross notional amounts for outstanding derivatives										€ 17,800,000	€ 13,900,000	£ 1,300,000	£ 1,800,000	$ 17,000,000	$ 5,300,000	$ 59,000,000	$ 73,500,000
Gross fair value of Derivatives not designated as hedging instruments (forward contracts)					369,000	16,000	1,408,000	380,000
Foreign currency exchange loss on foreign contracts	(1,953,000)	(2,462,000)	(649,000)	(130,000)
Foreign currency transactions gain	$ 2,122,000	$ 2,617,000	$ 1,114,000	$ 308,000