Share Based Compensation (Tables)

3 Months Ended

Apr. 30, 2012

Share-based Compensation [Abstract]

Weighted average assumptions by grant year

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model, with the following weighted average assumptions:

	Three Months Ended
	April 30, 2012
Risk-free interest rate	0.86		%
Expected dividend yield	1.33		%
Expected volatility factor	49.65		%
Expected option term (in years)	3.75
Weighted average grant date fair value	$	21.91