Earnings Per Share - Computation for Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended
	May 31, 2014	May 31, 2013
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	25,973,227	26,038,068
Effect of dilutive options	14,150	17,801
Diluted weighted average common shares outstanding	25,987,377	26,055,869
Per share amounts:
Net earnings - basic	$ 0.31	$ 0.33
Net earnings - diluted	$ 0.31	$ 0.33
Cash dividends	$ 0.175