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Investments (Schedule of Investment Securities, Aggregated by Investment Type and Length of Time) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 26, 2011 | Jun. 27, 2010
--- | --- | ---
Fair Value, Less than 12 Months | $ 41,350 | $ 143,817
Unrealized Loss, Less than 12 Months | (127) | (181)
Fair Value, Greater than 12 Months |  |
Unrealized Loss, Greater than 12 Months |  |
Fair Value, Total | 41,350 | 143,817
Unrealized Loss, Total | (127) | (181)
Number of securities with an unrealized loss | 20 | 42
Municipal Bonds [Member] |  |
Fair Value, Less than 12 Months | 14,348 | 117,470
Unrealized Loss, Less than 12 Months | (10) | (117)
Fair Value, Greater than 12 Months |  |
Unrealized Loss, Greater than 12 Months |  |
Fair Value, Total | 14,348 | 117,470
Unrealized Loss, Total | (10) | (117)
Corporate Bonds [Member] |  |
Fair Value, Less than 12 Months | 20,484 | 11,126
Unrealized Loss, Less than 12 Months | (115) | (20)
Fair Value, Greater than 12 Months |  |
Unrealized Loss, Greater than 12 Months |  |
Fair Value, Total | 20,484 | 11,126
Unrealized Loss, Total | (115) | (20)
Municipal Variable Rate Demand Notes [Member] |  |
Fair Value, Less than 12 Months |  | 5,006
Unrealized Loss, Less than 12 Months |  | (1)
Fair Value, Greater than 12 Months |  |
Unrealized Loss, Greater than 12 Months |  |
Fair Value, Total |  | 5,006
Unrealized Loss, Total |  | (1)
Certificates of Deposit [Member] |  |
Fair Value, Less than 12 Months |  |
Unrealized Loss, Less than 12 Months |  |
Fair Value, Greater than 12 Months |  |
Unrealized Loss, Greater than 12 Months |  |
Fair Value, Total |  |
Unrealized Loss, Total |  |
Commercial Paper [Member] |  |
Fair Value, Less than 12 Months |  |
Unrealized Loss, Less than 12 Months |  |
Fair Value, Greater than 12 Months |  |
Unrealized Loss, Greater than 12 Months |  |
Fair Value, Total |  |
Unrealized Loss, Total |  |
U.S. Agency Securities [Member] |  |
Fair Value, Less than 12 Months | 6,518 | 5,120
Unrealized Loss, Less than 12 Months | (2) | (32)
Fair Value, Greater than 12 Months |  |
Unrealized Loss, Greater than 12 Months |  |
Fair Value, Total | 6,518 | 5,120
Unrealized Loss, Total | (2) | (32)
U.S. Government Securities [Member] |  |
Fair Value, Less than 12 Months |  |
Unrealized Loss, Less than 12 Months |  |
Fair Value, Greater than 12 Months |  |
Unrealized Loss, Greater than 12 Months |  |
Fair Value, Total |  |
Unrealized Loss, Total |  |
Non-U.S. Government Securities [Member] |  |
Fair Value, Less than 12 Months |  | 5,095
Unrealized Loss, Less than 12 Months |  | (11)
Fair Value, Greater than 12 Months |  |
Unrealized Loss, Greater than 12 Months |  |
Fair Value, Total |  | 5,095
Unrealized Loss, Total |  | $ (11)
Less than 12 Months [Member] |  |
Number of securities with an unrealized loss | 20 | 42
Greater than 12 Months [Member] |  |
Number of securities with an unrealized loss |  |

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- Definition Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph b(3) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph b(3) -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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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