Earnings Per Share - Computation for Basic and Diluted Earnings Per Share (Detail) - $ / shares	3 Months Ended
	May. 31, 2015	May. 31, 2014
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	25,586,596	25,973,227
Effect of dilutive options	12,459	14,150
Diluted weighted average common shares outstanding	25,599,055	25,987,377
Per share amounts:
Net earnings - basic	$ 0.36	$ 0.31
Net earnings - diluted	0.36	0.31
Cash dividends	$ 0.175	$ 0.175