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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
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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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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