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Fair Value Measurements (Details Textual) (USD $)
Jun. 28, 2014
Mar. 29, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Noncurrent $ 1,109,645,000 $ 1,190,775,000 [1]
Available-for-sale Securities 3,509,813,000 3,605,349,000
Two And One Two Five Percent 2019 Senior Debentures [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debentures 501,700,000  
Three Point Zero Percent 2021 Senior Debentures [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debentures 505,900,000  
Auction Rate Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Noncurrent 20,704,000 20,160,000
Two And Six Two Five Percent Senior Convertible Debentures [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debentures $ 1,000,000,000  
[1] Derived from audited financial statements