Earnings Per Share - Computation for Basic and Diluted Earnings (loss) Per Share (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	26,010,571	26,189,917	26,034,617	25,744,344
Effect of dilutive options		12,513		12,487
Diluted weighted average common shares outstanding	26,010,571	26,202,430	26,034,617	25,756,831
Earnings per share
Net earnings - basic	$ 0.41	$ 0.40	$ 1.14	$ 1.14
Net earnings - diluted	0.41	0.40	1.14	1.14
Cash dividends	$ 0.225	$ 0.225	$ 0.675	$ 0.650