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Cash, Cash Equivalents and Short-Term Investments (Details 2)
$ in Thousands
Mar. 01, 2019
USD ($)
Amortized cost of short-term fixed income securities  
Due within one year, Amortized Cost $ 642,860
Due between one and two years, Amortized Cost 562,585
Due between two and three years, Amortized Cost 190,095
Due after three years, Amortized Cost 104,673
Total, Amortized Cost 1,500,213
Estimated fair value of short-term fixed income securities  
Due within one year, Estimated Fair value 640,549
Due between one and two years, Estimated Fair value 556,764
Due between two and three years, Estimated Fair value 187,312
Due after three years, Estimated Fair value 102,786
Total, Estimated Fair value $ 1,487,411