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Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2018
Apr. 01, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable equity securities in private companies $ 36,700  
2019 Notes Payable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, principal amount $ 500,000  
Stated interest rate 2.125%  
2019 Notes Payable [Member] | Convertible Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debentures $ 496,600  
2021 Notes Payable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, principal amount $ 500,000  
Stated interest rate 3.00%  
2021 Notes Payable [Member] | Senior Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debentures $ 498,900  
2024 Notes Payable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, principal amount $ 750,000  
Stated interest rate 2.95%  
2024 Notes Payable [Member] | Senior Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debentures $ 719,700  
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value 3,476,786 $ 3,366,594
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets measured at fair value $ 0 $ 0