Accounting for Stock-Based Compensation (Tables)

9 Months Ended

Feb. 29, 2012

Accounting for Stock-Based Compensation

Assumptions used in the Black-Scholes option pricing model to estimate the fair value of each stock option grant

	Nine Months Ended
	February 29/28,
	2012		2011
Risk-free interest rate	1.5	%	1.8	%
Expected volatility of common stock	45.8	%	47.0	%
Dividend yield	1.0	%	0.0	%
Expected option term in years	5.7		5.8

Summary of stock option activity

					Weighted
			Weighted		Average
	Number of		Average		Remaining	Aggregate
	Options		Exercise		Contractual	Intrinsic
	(in thousands)		Price		Life (years)	Value
Outstanding at May 31, 2011	1,994		$	18.56
Granted	162		$	28.96
Exercised	(335	)	$	20.00
Cancelled	(78	)	$	18.69
Outstanding at February 29, 2012	1,743		$	19.61	5.9	$	8,835
Exercisable at February 29, 2012	862		$	18.20	4.0	$	5,186

Schedule of restricted share activity

	Number of		Weighted Average
	Shares		Fair Value
	(in thousands)		on Grant Date
Unvested at May 31, 2011	1,374		$	23.06
Granted	677		$	24.64
Vested	(325	)	$	26.71
Forfeited	(107	)	$	23.90
Unvested at February 29, 2012	1,619		$	22.92