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Cash, Cash Equivalents and Short-Term Investments (Details 1) $ in Thousands | Jun. 01, 2018 USD ($) securities | Dec. 01, 2017 USD ($) 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 | $ 2,395,257 | $ 2,010,339
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (28,241) | (7,862)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 798,118 | 872,620
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (8,597) | (6,358)
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities |  |
Available-for-sale Securities, Amortized Cost Basis | $ 6,370,252 | $ 5,831,289
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities | 1,210 | 894
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities | 331 | 360
Asset-backed Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 50,375 | $ 64,618
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (525) | (193)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 33,512 | 32,383
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (298) | (210)
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,806,212 | 1,338,232
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (25,141) | (5,459)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 461,358 | 500,689
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (6,970) | (4,666)
Municipal Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 17,987 | 11,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (279) | (115)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 945 | 598
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (24) | (17)
Foreign Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 3,787 | 2,388
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (65) | (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 | 516,896 | 593,296
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,231) | (2,087)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 302,303 | 338,950
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,305) | (1,465)
Fixed Income Investments |  |
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities |  |
Available-for-sale Securities, Amortized Cost Basis | 3,382,268 | 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 | 84,710 | 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 | 2,451,735 | 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 | 19,236 | 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 | 3,852 | 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 | $ 822,735 | $ 941,538

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