Cash, Cash Equivalents and Short-Term Investments (Details 1) $ in Thousands	Aug. 30, 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	$ 223,966	$ 551,404
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	273,486	1,020,199
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(85)	(8,101)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	$ (423)	$ (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	92	369
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities	148	577
Corporate debt securities
Schedule of Available-for-sale Securities
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	$ 222,357	$ 538,109
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	255,175	969,701
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(84)	(7,966)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(401)	(16,730)
Asset-backed securities
Schedule of Available-for-sale Securities
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	0	6,696
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	15,912	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	(21)	(313)
Municipal securities
Schedule of Available-for-sale Securities
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	1,609	6,599
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	0	11,532
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(1)	(81)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0	(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	2,399	4,154
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	$ (1)	$ (24)