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Investments (Contractual Maturities of Marketable Investments) (Details) - USD ($) $ in Thousands | Jun. 25, 2017 | Jun. 26, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | $ 99,989 |
After One, Within Five Years | 317,208 |
After Five, Within Ten Years | 61,144 |
After Ten Years | 0 |
Total | 478,341 | $ 439,151
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | 45,519 |
After One, Within Five Years | 107,947 |
After Five, Within Ten Years | 26,575 |
After Ten Years | 0 |
Total | 180,041 | 190,440
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | 48,515 |
After One, Within Five Years | 94,637 |
After Five, Within Ten Years | 34,569 |
After Ten Years | 0 |
Total | 177,721 | 168,767
Non-U.S. certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | 5,755 |
After One, Within Five Years | 114,624 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total | 120,379 | 73,127
U.S. certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | 0 |
After One, Within Five Years | 0 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Total | 0 | 3,500
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Within One Year | 200 |
After One, Within Five Years | 0 |
After Five, Within Ten Years | 0 |
After Ten Years | 0 |
Fair Value, Measurements, Recurring [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 478,341 | 439,151
Fair Value, Measurements, Recurring [Member] | Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 180,041 | 190,440
Fair Value, Measurements, Recurring [Member] | Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 177,721 | 168,767
Fair Value, Measurements, Recurring [Member] | Non-U.S. certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 120,379 | 73,127
Fair Value, Measurements, Recurring [Member] | U.S. certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 0 | 3,500
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 478,341 | 439,151
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 180,041 | 190,440
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 177,721 | 168,767
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Non-U.S. certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 120,379 | 73,127
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | $ 0 | $ 3,500

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