Marketable Securities (Summary Of Cash Equivalents And Marketable Securities) (Details) - USD ($) $ in Thousands		Jan. 01, 2017	Jul. 03, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 1,451,905	$ 1,343,717
Unrealized Gain		352	1,939
Unrealized (Loss)	[1]	(650)	(25)
Fair Value		1,451,607	1,345,631
Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		171,789	161,028
Unrealized Gain		6	10
Unrealized (Loss)	[1]	(7)
Fair Value		171,788	161,038
Marketable securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,280,116	1,182,689
Unrealized Gain		346	1,929
Unrealized (Loss)	[1]	(643)	(25)
Fair Value		1,279,819	1,184,593
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		475,678	441,925
Unrealized Gain		113	783
Unrealized (Loss)	[1]	(82)	(5)
Fair Value		475,709	442,703
Obligations of U.S. government-sponsored enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		353,967	316,368
Unrealized Gain		175	855
Unrealized (Loss)	[1]	(261)
Fair Value		353,881	317,223
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		136,711	119,680
Unrealized Gain			158
Unrealized (Loss)	[1]	(256)	(10)
Fair Value		136,455	119,828
Corporate debt securities and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		421,493	395,254
Unrealized Gain		64	143
Unrealized (Loss)	[1]	(51)	(10)
Fair Value		421,506	395,387
Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		64,056	70,490
Fair Value		$ 64,056	$ 70,490

[1] The Company evaluated the nature of the investments with a loss position at January 1, 2017 and July 3, 2016, 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 January 1, 2017 and July 3, 2016.