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Investments (Summary of Marketable Investments by Type) (Details) (USD $) In Thousands | Jun. 26, 2011 | Jun. 27, 2010
--- | --- | ---
Amortized Cost | $ 688,233 | $ 663,484
Gross Unrealized Gains | 7,093 | 5,671
Gross Unrealized Losses | (127) | (181)
Estimated Fair Value | 695,199 | 668,974
Municipal Bonds [Member] |  |
Amortized Cost | 391,465 | 441,653
Gross Unrealized Gains | 3,943 | 3,502
Gross Unrealized Losses | (10) | (117)
Estimated Fair Value | 395,398 | 445,038
Corporate Bonds [Member] |  |
Amortized Cost | 207,241 | 120,991
Gross Unrealized Gains | 2,312 | 1,478
Gross Unrealized Losses | (115) | (20)
Estimated Fair Value | 209,438 | 122,449
Municipal Variable Rate Demand Notes [Member] |  |
Amortized Cost | 295 | 15,685
Gross Unrealized Gains |  |
Gross Unrealized Losses |  | (1)
Estimated Fair Value | 295 | 15,684
Certificates of Deposit [Member] |  |
Amortized Cost | 10,003 |
Gross Unrealized Gains | 12 |
Gross Unrealized Losses |  |
Estimated Fair Value | 10,015 |
Commercial Paper [Member] |  |
Amortized Cost | 4,999 |
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Estimated Fair Value | 4,999 |
U.S. Agency Securities [Member] |  |
Amortized Cost | 67,244 | 72,531
Gross Unrealized Gains | 807 | 615
Gross Unrealized Losses | (2) | (32)
Estimated Fair Value | 68,049 | 73,114
U.S. Government Securities [Member] |  |
Amortized Cost |  | 7,533
Gross Unrealized Gains |  | 76
Estimated Fair Value |  | 7,609
Non-U.S. Government Securities [Member] |  |
Amortized Cost | 6,986 | 5,091
Gross Unrealized Gains | 19 |
Gross Unrealized Losses |  | (11)
Estimated Fair Value | $ 7,005 | $ 5,080

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + Details
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- Definition Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 4, 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: 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=6379932&loc=d3e22054-111558 + Details
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