Stock Benefit Plans And Stock-Based Compensation (Tables)

9 Months Ended

Aug. 31, 2011

Stock Benefit Plans And Stock-Based Compensation

Summary Of Stock Option Activities

Stock Options	Number of Shares Underlying Stock Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (years)		Aggregate Intrinsic Value
Outstanding at November 30, 2010		22,173		$	8.36		3.23	$	250,651
Granted		2,034			27.29
Exercised		(4,568	)		8.40
Forfeited or expired		(255	)		16.73
Outstanding at August 31, 2011		19,384		$	10.23		2.99	$	368,786
Vested and expected to vest at August 31, 2011		18,766		$	9.87		2.89	$	362,864
Exercisable at August 31, 2011		15,605		$	8.29		2.32	$	320,278

Summary Of Nonvested Stock Awards

Nonvested Stock Awards	Restricted Stock			Restricted Stock Units			Performance- based Restricted Stock Units			Total Number of Shares Underlying Stock Awards			Weighted- Average Grant Date Fair Value
Nonvested at November 30, 2010		4,314			1,659			4,092			10,065		$	9.47
Granted		1,125			360			274			1,759			26.70
Vested		(1,613	)		(490	)		—			(2,103	)		8.48
Forfeited		(240	)		(54	)		(20	)		(314	)		12.76
Nonvested at August 31, 2011		3,586			1,475			4,346			9,407		$	12.71

Summary Of Assumptions For Estimating Fair Value Of Stock-Based Awards

	Three Months Ended August 31,						Nine Months Ended August  31,
	2011			2010			2011			2010
Stock Option Grants:
Expected term of stock options (years)		4.8			4.8			4.8 –5.1			4.8 –5.1
Risk-free interest rate		1.30	%		1.70	%		1.30 –2.10	%		1.70 –2.40	%
Expected volatility		42	%		44	%		42	%		42– 44	%
Weighted-average grant date fair value (per share)	$	8.89		$	5.20		$	10.74		$	4.64
ESPP:
Expected term of ESPP (years)		0.5			0.5			0.5			0.5
Risk-free interest rate		0.20	%		0.20	%		0.20	%		0.20	%
Expected volatility		39	%		39	%		38– 39	%		35– 39	%
Weighted-average grant date fair value (per share)	$	6.94		$	3.63		$	6.56		$	2.87