Cash, Cash Equivalents and Short-Term Investments (Details 1) $ in Thousands	6 Months Ended	12 Months Ended
	May. 29, 2015 USD ($) securities	Nov. 28, 2014 USD ($) 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	$ 4,076	$ 14,520
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	$ (25)	$ (94)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities	3	8
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	$ 472,165	$ 357,156
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	$ 927	$ 519
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | securities	270	213
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	$ 3,425	$ 8,636
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(23)	(66)
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	335,218	291,890
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	821	443
US Treasury and Government
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	651	5,884
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(2)	(28)
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	88,491	43,507
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	27	64
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	43,184	21,759
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	74	12
Asset-backed 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	5,272	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	$ 5	$ 0