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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. 24, 2012 | Jun. 26, 2011
--- | --- | ---
Fair Value, Less than 12 Months | $ 65,209 | $ 41,350
Unrealized Loss, Less than 12 Months | (191) | (127)
Fair Value, Greater than 12 Months | 0 | 0
Unrealized Loss, Greater than 12 Months | 0 | 0
Fair Value, Total | 65,209 | 41,350
Unrealized Loss, Total | (191) | (127)
Number of securities with an unrealized loss | 33 | 20
Municipal Bonds [Member] |  |
Fair Value, Less than 12 Months | 30,102 | 14,348
Unrealized Loss, Less than 12 Months | (58) | (10)
Fair Value, Greater than 12 Months | 0 | 0
Unrealized Loss, Greater than 12 Months | 0 | 0
Fair Value, Total | 30,102 | 14,348
Unrealized Loss, Total | (58) | (10)
Corporate Bonds [Member] |  |
Fair Value, Less than 12 Months | 30,550 | 20,484
Unrealized Loss, Less than 12 Months | (123) | (115)
Fair Value, Greater than 12 Months | 0 | 0
Unrealized Loss, Greater than 12 Months | 0 | 0
Fair Value, Total | 30,550 | 20,484
Unrealized Loss, Total | (123) | (115)
Municipal Variable Rate Demand Notes [Member] |  |
Fair Value, Less than 12 Months | 0 | 0
Unrealized Loss, Less than 12 Months | 0 | 0
Fair Value, Greater than 12 Months | 0 | 0
Unrealized Loss, Greater than 12 Months | 0 | 0
Fair Value, Total | 0 | 0
Unrealized Loss, Total | 0 | 0
U.S. Agency Securities [Member] |  |
Fair Value, Less than 12 Months | 3,014 | 6,518
Unrealized Loss, Less than 12 Months | (7) | (2)
Fair Value, Greater than 12 Months | 0 | 0
Unrealized Loss, Greater than 12 Months | 0 | 0
Fair Value, Total | 3,014 | 6,518
Unrealized Loss, Total | (7) | (2)
Certificates of Deposit [Member] |  |
Fair Value, Less than 12 Months | 0 | 0
Unrealized Loss, Less than 12 Months | 0 | 0
Fair Value, Greater than 12 Months | 0 | 0
Unrealized Loss, Greater than 12 Months | 0 | 0
Fair Value, Total | 0 | 0
Unrealized Loss, Total | 0 | 0
Commercial Paper [Member] |  |
Fair Value, Less than 12 Months | 0 | 0
Unrealized Loss, Less than 12 Months | 0 | 0
Fair Value, Greater than 12 Months | 0 | 0
Unrealized Loss, Greater than 12 Months | 0 | 0
Fair Value, Total | 0 | 0
Unrealized Loss, Total | 0 | 0
Non-U.S. Government Securities [Member] |  |
Fair Value, Less than 12 Months | 1,543 | 0
Unrealized Loss, Less than 12 Months | (3) | 0
Fair Value, Greater than 12 Months | 0 | 0
Unrealized Loss, Greater than 12 Months | 0 | 0
Fair Value, Total | 1,543 | 0
Unrealized Loss, Total | $ (3) | $ 0
Less than 12 Months [Member] |  |
Number of securities with an unrealized loss | 33 | 20
Greater than 12 Months [Member] |  |
Number of securities with an unrealized loss | 0 | 0

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