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Cash, Cash Equivalents and Short-Term Investments (Details 1) $ in Thousands | Mar. 02, 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 | $ 2,483,290 | $ 2,010,339
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (26,172) | (7,862)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 813,906 | 872,620
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (9,175) | (6,358)
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities |  |
Available-for-sale Securities, Amortized Cost Basis | $ 6,182,513 | $ 5,831,289
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities | 1,237 | 894
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities | 342 | 360
Asset-backed Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 57,439 | $ 64,618
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (495) | (193)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 33,818 | 32,383
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (315) | (210)
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,811,370 | 1,338,232
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (22,326) | (5,459)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 479,654 | 500,689
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (7,502) | (4,666)
Municipal Notes |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 18,389 | 11,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (246) | (115)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 592 | 598
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (22) | (17)
Foreign Government Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 3,796 | 2,388
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (55) | (8)
US Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 592,296 | 593,296
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (3,050) | (2,087)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 299,842 | 338,950
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,336) | (1,465)
Fixed Income Investments |  |
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities |  |
Available-for-sale Securities, Amortized Cost Basis | 3,515,532 | 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 | 92,067 | 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 | 2,461,348 | 2,461,691
Fixed Income Investments | Municipal Notes |  |
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities |  |
Available-for-sale Securities, Amortized Cost Basis | 19,249 | 21,189
Fixed Income Investments | Foreign Government Debt 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 | US Treasury Securities |  |
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities |  |
Available-for-sale Securities, Amortized Cost Basis | $ 939,016 | $ 941,538

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