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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