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Investments (Contractual Maturities of Marketable Investments) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 25, 2012 | Jun. 26, 2011
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | $ 254,205 |
After One, Within Five Years | 264,832 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total | 519,037 | 695,199
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | 86,060 |
After One, Within Five Years | 118,382 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total | 204,442 |
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | 80,333 |
After One, Within Five Years | 101,384 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total | 181,717 |
Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | 65,000 |
After One, Within Five Years | 0 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total | 65,000 |
U.S. Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | 21,802 |
After One, Within Five Years | 42,965 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total | 64,767 |
Non-U.S. Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | 1,010 |
After One, Within Five Years | 2,101 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total | $ 3,111 |

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