Cash, Cash Equivalents and Short-Term Investments (Details 1) $ in Thousands	Mar. 03, 2017 USD ($) securities	Dec. 02, 2016 USD ($) securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 2,199,191	$ 2,031,478
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(11,107)	(11,658)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	16,955	40,493
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(21)	(81)
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract]
Available-for-sale Securities, Amortized Cost Basis	$ 4,654,850	$ 4,769,536
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities	1,019	1,052
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities	12	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	$ 99,481	$ 54,063
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(436)	(189)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	510	1,331
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)	(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	1,228,225	1,282,076
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(8,420)	(9,474)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	16,445	39,162
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(20)	(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	58,653	114,810
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(198)	(525)
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	812,832	580,529
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,053)	(1,470)
Fixed Income Investments [Member]
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract]
Available-for-sale Securities, Amortized Cost Basis	3,585,954	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	111,952	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	2,394,514	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	$ 137,243	$ 134,710