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Cash, Cash Equivalents and Short-Term Investments (Details 2)
$ in Thousands
Aug. 31, 2018
USD ($)
Amortized cost of short-term fixed Income Securities  
Due within one year, Amortized Cost $ 1,643,049
Due between one and two years, Amortized Cost 788,794
Due between two and three years, Amortized Cost 608,978
Due after three years, Amortized Cost 177,199
Total, Amortized Cost 3,218,020
Estimated Fair Value of Short-term fixed Income Securities  
Due within one year, Estimated Fair value 1,640,836
Due between one and two years, Estimated Fair value 782,312
Due between two and three years, Estimated Fair value 600,690
Due after three years, Estimated Fair value 173,488
Total, Estimated Fair value $ 3,197,326