Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified				3 Months Ended																				3 Months Ended
	Mar. 31, 2012 Auction Rate Securities [Member]	Jun. 25, 2011 Auction Rate Securities [Member]	Mar. 26, 2011 Auction Rate Securities [Member]	Mar. 31, 2012 Auction Rate Securities [Member] Minimum [Member]	Mar. 31, 2012 Auction Rate Securities [Member] Maximum [Member]	Mar. 31, 2012 Carrying (Reported) Amount, Fair Value Disclosure [Member] Senior Notes [Member] Note Agreement [Member]	Jun. 25, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member] Senior Notes [Member] Note Agreement [Member]	Mar. 26, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member] Senior Notes [Member] Note Agreement [Member]	Mar. 31, 2012 Total [Member] Senior Notes [Member] Note Agreement [Member]	Jun. 25, 2011 Total [Member] Senior Notes [Member] Note Agreement [Member]	Mar. 26, 2011 Total [Member] Senior Notes [Member] Note Agreement [Member]	Mar. 31, 2012 Total [Member]	Jun. 25, 2011 Total [Member]	Mar. 26, 2011 Total [Member]	Mar. 31, 2012 Quoted Prices in Acive Markets (Level 1) [Member]	Jun. 25, 2011 Quoted Prices in Acive Markets (Level 1) [Member]	Mar. 26, 2011 Quoted Prices in Acive Markets (Level 1) [Member]	Mar. 31, 2012 Prices With Other Observable Inputs (Level 2) [Member]	Jun. 25, 2011 Prices With Other Observable Inputs (Level 2) [Member]	Mar. 26, 2011 Prices With Other Observable Inputs (Level 2) [Member]	Mar. 31, 2012 Prices With Unobservable Inputs (Level 3) [Member]	Jun. 25, 2011 Prices With Unobservable Inputs (Level 3) [Member]	Mar. 26, 2011 Prices With Unobservable Inputs (Level 3) [Member]	Mar. 31, 2012 Prices With Unobservable Inputs (Level 3) [Member] Auction Rate Securities [Member]
Assets:
Cash equivalents												$ 451,521	$ 267,221	$ 151,941	$ 451,521	$ 267,221	$ 151,941	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Investment securities	6,570	7,503	5,435									6,570	7,503	5,435	0	0	0	0	0	0	6,570	7,503	5,435
Funds associated with Israeli post employment benefits												15,264	17,170	16,896	0	0	0	15,264	17,170	16,896	0	0	0
Foreign currency forward contracts, net													3,353	3,235		0	0		3,353	3,235		0	0
Derivative Assets														2,092						2,092
Total												473,355	295,247	179,599	451,521	267,221	151,941	15,264	20,523	22,223	6,570	7,503	5,435
Liabilities:
Fair value of contingent consideration												2,900			0			0			2,900
Foreign currency forward contracts, net												698			0			698			0
Interest rate swap agreements												13,248	7,283		0	0		13,248	7,283		0	0	0
Total												16,846	7,283		0	0		13,946	7,283		2,900	0
Fixed rate long-term debt						965,000	615,000	615,000	1,012,670	650,812	628,050
Auction Rate Securities, Par Value, Total	18,000
Time period in which interest rates of auction rate securities are reset				7 days	35 days
Percent increase in the discount rate of auction rate securities that would result in a decrease in fair value	1.00%
Decrease in fair value of auction rate securities if the discount rate would increase by 100 basis points																								$ 200
Debt Instrument, Maturity Term				5 years