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Investments (Summary of Marketable Investments by Type) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Jun. 24, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 834,249 | $ 561,470
Gross Unrealized Gains | 2,695 | 4,349
Gross Unrealized Losses | (3,098) | (191)
Estimated Fair Value | 833,846 | 565,628
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 250,206 | 209,626
Gross Unrealized Gains | 817 | 2,036
Gross Unrealized Losses | (1,314) | (58)
Estimated Fair Value | 249,709 | 211,604
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 192,147 | 144,942
Gross Unrealized Gains | 1,678 | 1,848
Gross Unrealized Losses | (1,765) | (123)
Estimated Fair Value | 192,060 | 146,667
U.S. Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 39,288 | 68,156
Gross Unrealized Gains | 186 | 450
Gross Unrealized Losses | 0 | (7)
Estimated Fair Value | 39,474 | 68,599
Non-U.S. certificates of deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 345,000 | 130,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 345,000 | 130,000
Non-U.S. Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,608 | 8,746
Gross Unrealized Gains | 14 | 15
Gross Unrealized Losses | (19) | (3)
Estimated Fair Value | $ 7,603 | $ 8,758

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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