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Fair Value Measurements for Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Jun. 27, 2015
Dec. 27, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of available-for-sale securities $ 6,847,645 $ 6,230,730
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of available-for-sale securities 1,546,104 1,439,360
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of available-for-sale securities 5,301,541 4,791,370
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of available-for-sale securities $ 0 $ 0