Investments (Summary of Marketable Investments by Type) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 899,321	$ 834,249
Gross Unrealized Gains	3,197	2,695
Gross Unrealized Losses	(1,553)	(3,098)
Estimated Fair Value	900,965	833,846
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	272,382	250,206
Gross Unrealized Gains	1,255	817
Gross Unrealized Losses	(502)	(1,314)
Estimated Fair Value	273,135	249,709
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	207,130	192,147
Gross Unrealized Gains	1,704	1,678
Gross Unrealized Losses	(1,049)	(1,765)
Estimated Fair Value	207,785	192,060
U.S. Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	31,222	39,288
Gross Unrealized Gains	226	186
Gross Unrealized Losses	0	0
Estimated Fair Value	31,448	39,474
Non-U.S. Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	380,000	345,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	380,000	345,000
Non-U.S. Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,587	7,608
Gross Unrealized Gains	12	14
Gross Unrealized Losses	(2)	(19)
Estimated Fair Value	$ 8,597	$ 7,603