Accounting for Stock-Based Compensation (Tables)

3 Months Ended

Aug. 31, 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

	Three Months Ended
	August 31, 2013
Risk-free interest rate	1.4	%
Expected volatility of common stock	49.1	%
Dividend yield	1.2	%
Expected option term in years	5.2