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Schedule of Unrealized Loss on Available for Sale Investments (Detail) - USD ($)
$ in Thousands
Jun. 27, 2015
Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value $ 28,062 $ 28,352
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 133 149
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 3,503 14,580
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 11 194
Available-for-sale investments with unrealized losses, Fair Value, Total 31,565 42,932
Available-for-sale investments with unrealized losses, Unrealized Loss, Total 144 343
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value 5,010 2,006
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 29 13
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value   2,447
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss   37
Available-for-sale investments with unrealized losses, Fair Value, Total 5,010 4,453
Available-for-sale investments with unrealized losses, Unrealized Loss, Total 29 50
Corporate bonds and direct obligations of government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value 21,786 19,354
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 102 135
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 3,503 11,373
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 11 149
Available-for-sale investments with unrealized losses, Fair Value, Total 25,289 30,727
Available-for-sale investments with unrealized losses, Unrealized Loss, Total 113 284
U.S. Treasury Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value 1,266 6,992
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 2 1
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value   760
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss   8
Available-for-sale investments with unrealized losses, Fair Value, Total 1,266 7,752
Available-for-sale investments with unrealized losses, Unrealized Loss, Total $ 2 $ 9