Net Income Per Share (Anti-Dilutive Effect Of Shares Not Included In Computation Of Diluted Net Income Per Share) (Details)	12 Months Ended									3 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2009	Nov. 30, 2011 Stock Option [Member]	Nov. 30, 2010 Stock Option [Member]	Nov. 30, 2009 Stock Option [Member]	Nov. 30, 2011 Stock Awards [Member]	Nov. 30, 2010 Stock Awards [Member]	Nov. 30, 2009 Stock Awards [Member]	Feb. 28, 2011 Performance-Based Restricted Stock Units [Member]
Anti-Dilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-diluted common stock equivalents	1,668,000	4,563,000	25,181,000	1,264,000	4,487,000	23,882,000	404,000	76,000	1,299,000
Number of underlying stock awards granted										300,000