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Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
Jun. 27, 2015
Mar. 28, 2015
[1]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Noncurrent $ 248,431 $ 266,902
Senior Notes [Member] | 2.125% 2019 Senior Debentures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of convertible notes 496,700  
Senior Notes [Member] | 3.0% 2021 Senior Debentures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of convertible notes 505,200  
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Noncurrent 10,409  
Convertible Notes [Member] | 2.625% Senior Convertible Debentures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of convertible notes $ 922,800  
[1] Derived from audited financial statements