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Investments (Contractual Maturities of Marketable Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 24, 2012
Within One Year $ 302,138
After One, Within Five Years 259,506
After Five, Within Ten Years 3,984
After Ten Years 0
Total 565,628
Municipal Bonds [Member]
  
Within One Year 85,261
After One, Within Five Years 126,343
After Five, Within Ten Years 0
After Ten Years 0
Total 211,604
Corporate Bonds [Member]
  
Within One Year 50,462
After One, Within Five Years 92,221
After Five, Within Ten Years 3,984
After Ten Years 0
Total 146,667
Municipal Variable Rate Demand Notes [Member]
  
Within One Year 0
After One, Within Five Years 0
After Five, Within Ten Years 0
After Ten Years 0
Total 0
U.S. Agency Securities [Member]
  
Within One Year 31,856
After One, Within Five Years 36,743
After Five, Within Ten Years 0
After Ten Years 0
Total 68,599
Certificates of Deposit [Member]
  
Within One Year 130,000
After One, Within Five Years 0
After Five, Within Ten Years 0
After Ten Years 0
Total 130,000
Commercial Paper [Member]
  
Within One Year 0
After One, Within Five Years 0
After Five, Within Ten Years 0
After Ten Years 0
Total 0
Non-U.S. Government Securities [Member]
  
Within One Year 4,559
After One, Within Five Years 4,199
After Five, Within Ten Years 0
After Ten Years 0
Total $ 8,758