Stock Benefit Plans And Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Nov. 30, 2011 years
Stock Benefit Plans And Stock-Based Compensation [Abstract]
Number of Shares Underlying Stock Options, Outstanding at November 30, 2010	22,173
Number of Shares Underlying Stock Options, Granted	2,211
Number of Shares Underlying Stock Options, Exercised	(8,018)
Number of Shares Underlying Stock Options, Forfeited or expired	(402)
Number of Shares Underlying Stock Options, Outstanding at November 30, 2011	15,964
Number of Shares Underlying Stock Options, Vested and expected to vest at November 30, 2011	15,431
Number of Shares Underlying Stock Options, Exercisable at November 30, 2011	12,573
Weighted-Average Exercise Price, Outstanding at November 30, 2010	$ 8.36
Weighted-Average Exercise Price, Granted	$ 27.12
Weighted-Average Exercise Price, Exercised	$ 9.55
Weighted-Average Exercise Price, Forfeited or expired	$ 16.25
Weighted-Average Exercise Price, Outstanding at November 30, 2011	$ 10.16
Weighted-Average Exercise Price, Vested and expected to vest at November 30, 2011	$ 9.75
Weighted-Average Exercise Price, Exercisable at Outstanding, Exercisable at November 30, 2011	$ 7.68
Weighted-Average Remaining Contractual Term, Outstanding at November 30, 2011 (in years)	3.21
Weighted-Average Remaining Contractual Term, Vested and expected to vest at November 30, 2011 (in years)	3.11
Weighted-Average Remaining Contractual Term, Exercisable at November 30, 2011 (in years)	2.55
Aggregate Intrinsic Value, Outstanding at November 30, 2011	$ 277,938
Aggregate Intrinsic Value, Vested and expected to vest at November 30, 2011	274,693
Aggregate Intrinsic Value, Exercisable at November 30, 2011	$ 248,256