Accounting for Stock-Based Compensation (Tables)

9 Months Ended

Feb. 28, 2013

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 28/29,
	2013		2012
Risk-free interest rate	0.6	%	1.5	%
Expected volatility of common stock	51	%	46	%
Dividend yield	2.3	%	1.0	%
Expected option term in years	5.4		5.7