Earnings per Share - Computation for Basic and Diluted Earnings (loss) per Share (Detail) - $ / shares	3 Months Ended
	May 31, 2018	May 31, 2017
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	25,333,673	25,422,856
Effect of dilutive options	30,099	13,931
Diluted weighted average common shares outstanding	25,363,772	25,436,787
Earnings per share
Net earnings - basic	$ 0.37	$ 0.31
Net earnings - diluted	0.36	0.31
Cash dividends	$ 0.200	$ 0.175