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Investments (Contractual Maturities of Marketable Investments) (Details)
$ in Thousands
Jun. 26, 2016
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Within One Year $ 123,490
After One, Within Five Years 244,286
After Five, Within Ten Years 71,375
After Ten Years 0
Total 439,151
Municipal bonds  
Schedule of Available-for-sale Securities [Line Items]  
Within One Year 31,874
After One, Within Five Years 124,745
After Five, Within Ten Years 33,821
After Ten Years 0
Total 190,440
Corporate bonds  
Schedule of Available-for-sale Securities [Line Items]  
Within One Year 14,672
After One, Within Five Years 116,541
After Five, Within Ten Years 37,554
After Ten Years 0
Total 168,767
Non-U.S. certificates of deposit  
Schedule of Available-for-sale Securities [Line Items]  
Within One Year 73,127
After One, Within Five Years 0
After Five, Within Ten Years 0
After Ten Years 0
Total 73,127
U.S. certificates of deposit  
Schedule of Available-for-sale Securities [Line Items]  
Within One Year 500
After One, Within Five Years 3,000
After Five, Within Ten Years 0
After Ten Years 0
Total 3,500
Commercial Paper  
Schedule of Available-for-sale Securities [Line Items]  
Within One Year 3,317
After One, Within Five Years 0
After Five, Within Ten Years 0
After Ten Years 0
Total $ 3,317