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Cash, Cash Equivalents and Short-Term Investments (Details 2)
$ in Thousands
Nov. 30, 2018
USD ($)
Amortized cost and Estimated Fair Value of Short-term fixed Income Securities [Abstract]  
Due within one year, Amortized Cost $ 615,867
Due between one and two years, Amortized Cost 574,554
Due between two and three years, Amortized Cost 289,033
Due after three years, Amortized Cost 132,061
Total, Amortized Cost 1,611,515
Due within one year, Estimated Fair value 612,104
Due between one and two years, Estimated Fair value 564,199
Due between two and three years, Estimated Fair value 282,144
Due after three years, Estimated Fair value 127,740
Total, Estimated Fair Value $ 1,586,187