Cash, Cash Equivalents and Short-Term Investments (Details 1) $ in Thousands	Aug. 31, 2018 USD ($) securities	Dec. 01, 2017 USD ($) securities
Schedule of Available-for-sale Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 1,269,311	$ 2,010,339
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(16,964)	(7,862)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	331,200	872,620
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4,346)	(6,358)
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities
Available-for-sale Securities, Amortized Cost Basis	$ 4,965,165	$ 5,831,289
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year \| securities	767	894
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year \| securities	197	360
Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 28,820	$ 64,618
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(240)	(193)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	17,560	32,383
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(145)	(210)
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,218,367	1,338,232
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(16,414)	(5,459)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	312,698	500,689
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4,176)	(4,666)
Municipal Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	17,975	11,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(281)	(115)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	942	598
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(25)	(17)
Foreign Government Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,149	2,388
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(29)	(8)
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	593,296
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(2,087)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	0	338,950
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(1,465)
Fixed Income Investments
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities
Available-for-sale Securities, Amortized Cost Basis	3,218,020	3,525,217
Fixed Income Investments \| Asset-backed Securities
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities
Available-for-sale Securities, Amortized Cost Basis	77,393	98,403
Fixed Income Investments \| Corporate Debt Securities
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities
Available-for-sale Securities, Amortized Cost Basis	2,471,739	2,461,691
Fixed Income Investments \| Municipal Securities
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities
Available-for-sale Securities, Amortized Cost Basis	19,223	21,189
Fixed Income Investments \| Foreign Government Securities
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities
Available-for-sale Securities, Amortized Cost Basis	4,178	2,396
Fixed Income Investments \| U.S. Treasury Securities
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities
Available-for-sale Securities, Amortized Cost Basis	$ 645,487	$ 941,538

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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