Cash, Cash Equivalents and Short-Term Investments (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 01, 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	$ 336,565	$ 559,160
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	(584)	(4,562)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	15,583	25,586
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, gross unrealized losses	(234)	(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	10	13
Number of securities in a continuous unrealized loss position for less than twelve months	112	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	184,432	408,178
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	(461)	(4,438)
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, fair value	15,583	22,918
Available-for-sale securities in a continuous unrealized loss position for more than twelve months, gross unrealized losses	(234)	(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	26,511	17,125
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	(6)	(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	125,622	133,857
Available-for-sale securities in a continuous unrealized loss position for less than twelve months, gross unrealized losses	$ (117)	$ (121)