Earnings Per Share - Computation for Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended
	May 31, 2013	May 31, 2012
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	26,038,068	25,963,369
Effect of dilutive options	17,801	20,538
Diluted weighted average common shares outstanding	26,055,869	25,983,907
Per share amounts:
Net earnings - basic	$ 0.33	$ 0.15
Net earnings - diluted	$ 0.33	$ 0.15
Cash dividends		$ 0.175