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Investments (Summary of Marketable Investments by Type) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 30, 2014
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 951,882 $ 834,249
Gross Unrealized Gains 3,554 2,695
Gross Unrealized Losses (863) (3,098)
Estimated Fair Value 954,573 833,846
Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 306,484 250,206
Gross Unrealized Gains 1,598 817
Gross Unrealized Losses (289) (1,314)
Estimated Fair Value 307,793 249,709
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 227,500 192,147
Gross Unrealized Gains 1,742 1,678
Gross Unrealized Losses (574) (1,765)
Estimated Fair Value 228,668 192,060
U.S. Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 27,095 39,288
Gross Unrealized Gains 189 186
Gross Unrealized Losses 0 0
Estimated Fair Value 27,284 39,474
Non-U.S. Certificates of Deposit [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 383,758 345,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 383,758 345,000
Non-U.S. Government Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,045 7,608
Gross Unrealized Gains 25 14
Gross Unrealized Losses 0 (19)
Estimated Fair Value $ 7,070 $ 7,603