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Cash, Cash Equivalents and Short-Term Investments (Details 1) $ in Thousands | Sep. 01, 2017 USD ($) securities | Dec. 02, 2016 USD ($) securities
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 1,587,578 | $ 2,031,478
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (4,070) | (11,658)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 153,605 | 40,493
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (816) | (81)
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 5,364,183 | $ 4,769,536
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities | 570 | 1,052
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities | 90 | 23
Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 62,235 | $ 54,063
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (150) | (189)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 1,495 | 1,331
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (12) | (1)
Corporate Bonds And Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 710,735 | 1,282,076
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,497) | (9,474)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 94,397 | 39,162
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (503) | (80)
Municipal Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 6,387 | 114,810
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (23) | (525)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 10,077 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (28) | 0
US Treasury and Government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 808,221 | 580,529
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,400) | (1,470)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value | 47,636 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (273) | 0
Fixed Income Investments [Member] |  |
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract] |  |
Available-for-sale Securities, Amortized Cost Basis | 3,589,633 | 3,758,221
Fixed Income Investments [Member] | Asset-backed Securities [Member] |  |
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract] |  |
Available-for-sale Securities, Amortized Cost Basis | 99,295 | 111,009
Fixed Income Investments [Member] | Corporate Bonds And Commercial Paper [Member] |  |
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract] |  |
Available-for-sale Securities, Amortized Cost Basis | 2,427,062 | 2,464,769
Fixed Income Investments [Member] | Municipal Notes [Member] |  |
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 145,850 | $ 134,710

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