Marketable Securities (Estimated Fair Value Of Investments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014		Jun. 29, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 958,174		$ 890,009
Unrealized Gain	399		568
Unrealized (Loss)	(145)	[1]	(11)	[1]
Fair Value	958,428		890,566
Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	76,841		35,102
Fair Value	76,841		35,102
Marketable securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	881,333		854,907
Unrealized Gain	399		568
Unrealized (Loss)	(145)	[1]	(11)	[1]
Fair Value	881,587		855,464
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	437,160		426,777
Unrealized Gain	307		455
Unrealized (Loss)	(46)	[1]	(2)	[1]
Fair Value	437,421		427,230
Obligations of U.S. government-sponsored enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	147,937		133,131
Unrealized Gain	35		46
Unrealized (Loss)	(57)	[1]	(2)	[1]
Fair Value	147,915		133,175
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	77,472		60,267
Unrealized Gain	48		49
Unrealized (Loss)	(10)	[1]	(4)	[1]
Fair Value	77,510		60,312
Corporate debt securities and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	263,206		253,429
Unrealized Gain	9		18
Unrealized (Loss)	(32)	[1]	(3)	[1]
Fair Value	263,183		253,444
Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,399		16,405
Fair Value	$ 32,399		$ 16,405

[1] The Company evaluated the nature of the investments with a loss position at September 28, 2014 and June 29, 2014, which are primarily obligations of the U.S. government and its sponsored enterprises, municipal bonds and U.S. corporate notes.  In evaluating the investments, the Company considered the duration of the impairments, and the amount of the impairments relative to the underlying portfolio and concluded that such amounts were not other-than-temporary. The Company principally holds securities until maturity, however, they may be sold under certain circumstances.  Unrealized losses on the investments greater than twelve months old were not significant as of September 28, 2014 and June 29, 2014.