Cash, Cash Equivalents and Short-Term Investments (Details 2) $ in Thousands	Dec. 01, 2017 USD ($)
Amortized cost and Estimated Fair Value of Short-term fixed Income Securities [Abstract]
Due within one year, Amortized Cost	$ 1,025,894
Due between one and two years, Amortized Cost	1,294,919
Due between two and three years, Amortized Cost	815,254
Due after three years, Amortized Cost	389,150
Total, Amortized Cost	3,525,217
Due within one year, Estimated Fair value	1,023,639
Due between one and two years, Estimated Fair value	1,289,307
Due between two and three years, Estimated Fair value	812,828
Due after three years, Estimated Fair value	387,928
Total, Estimated Fair value	$ 3,513,702