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Cash, Cash Equivalents and Short-Term Investments (Details 1) $ in Thousands | Mar. 01, 2019 USD ($) securities | Nov. 30, 2018 USD ($) securities
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Schedule of Available-for-sale Securities |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 69,091 | $ 551,404
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 1,366,755 | 1,020,199
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (143) | (8,101)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | $ (12,788) | $ (17,272)
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities | 45 | 369
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities | 818 | 577
Asset-backed Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 36 | $ 6,696
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 30,209 | 34,812
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | 0 | (54)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (185) | (313)
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 67,201 | 538,109
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 1,318,108 | 969,701
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (137) | (7,966)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (12,439) | (16,730)
Municipal Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 1,854 | 6,599
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 16,053 | 11,532
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (6) | (81)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (151) | (205)
Foreign Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 2,385 | 4,154
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | $ (13) | $ (24)

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