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Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Dec. 28, 2019
Mar. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Noncurrent $ 0 $ 53,433
Cost Method Investments, Fair Value Disclosure 87,100  
Three Point Zero Percent 2021 Senior Debentures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Face Amount $ 500,000  
Debt Instrument, Interest Rate, Stated Percentage 3.00%  
Debt Instrument, Maturity Date Mar. 15, 2021  
Fair value of convertible notes $ 506,300  
Two Point and Nine Five Percent 2024 Senior Debentures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Face Amount $ 750,000  
Debt Instrument, Interest Rate, Stated Percentage 2.95%  
Debt Instrument, Maturity Date Jun. 01, 2024  
Fair value of convertible notes $ 770,700  
Three Point Zero Percent 2021 Senior Debentures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Face Amount 500,000 500,000
Two Point and Nine Five Percent 2024 Senior Debentures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Face Amount $ 750,000 $ 750,000
Debt Instrument, Interest Rate, Stated Percentage 2.95%