Cash, Cash Equivalents and Short-Term Investments (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 02, 2012 securities	Dec. 02, 2011 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	$ 292,497	$ 559,160
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	(647)	(4,562)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	13,187	25,586
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, gross unrealized losses	(29)	(233)
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Number of securities in a continuous unrealized loss position for more than twelve months	7	13
Number of securities in a continuous unrealized loss position for less than twelve months	90	213
Corporate bonds and commercial paper [Member]
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	137,135	408,178
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	(576)	(4,438)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	13,187	22,918
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, gross unrealized losses	(29)	(232)
Municipal securities [Member]
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	8,625	17,125
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	(1)	(3)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	0	2,668
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, gross unrealized losses	0	(1)
U.S. Treasury and agency securities [Member]
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	146,737	133,857
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	$ (70)	$ (121)