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Investments (Contractual Maturities of Marketable Investments) (Details) (USD $) In Thousands | Jun. 26, 2011 | Jun. 27, 2010
--- | --- | ---
Within One Year | $ 252,932 |
After One, Within Five Years | 441,972 |
After Five, Within Ten Years |  |
After Ten Years | 295 |
Total | 695,199 | 668,974
Municipal Bonds [Member] |  |
Within One Year | 149,533 |
After One, Within Five Years | 245,865 |
After Five, Within Ten Years |  |
After Ten Years |  |
Total | 395,398 | 445,038
Corporate Bonds [Member] |  |
Within One Year | 79,127 |
After One, Within Five Years | 130,311 |
After Five, Within Ten Years |  |
After Ten Years |  |
Total | 209,438 | 122,449
Municipal Variable Rate Demand Notes [Member] |  |
After Five, Within Ten Years |  |
After Ten Years | 295 |
Total | 295 | 15,684
Certificates of Deposit [Member] |  |
Within One Year | 5,011 |
After One, Within Five Years | 5,004 |
After Five, Within Ten Years |  |
After Ten Years |  |
Total | 10,015 |
Commercial Paper [Member] |  |
Within One Year | 4,999 |
After Five, Within Ten Years |  |
After Ten Years |  |
Total | 4,999 |
U.S. Government Securities [Member] |  |
Total |  | 7,609
Non-U.S. Government Securities [Member] |  |
Within One Year | 5,000 |
After One, Within Five Years | 2,005 |
After Five, Within Ten Years |  |
After Ten Years |  |
Total | 7,005 | 5,080
U.S. Agency Securities [Member] |  |
Within One Year | 9,262 |
After One, Within Five Years | 58,787 |
After Five, Within Ten Years |  |
After Ten Years |  |
Total | $ 68,049 | $ 73,114

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