Cash, Cash Equivalents and Short-Term Investments (Details 1) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Aug. 29, 2014 securities	Nov. 29, 2013 securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	$ 47,993
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(286)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	16	0
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract]
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, fair value	443,902	344,559
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	(529)	(938)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	208	177
Corporate bonds and commercial paper
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	18,577
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(136)
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract]
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, fair value	256,849	225,759
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	(289)	(631)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	29,416
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(150)
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract]
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, fair value	169,621	105,278
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	(232)	(283)
Foreign government securities
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract]
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, fair value	7,595	0
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	(3)	0
Municipal securities
Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities [Abstract]
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, fair value	9,837	13,522
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	$ (5)	$ (24)