Earnings Per Share - Computation for Basic and Diluted Earnings Per Share (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	25,974,412	26,029,359	25,965,370	26,034,122
Diluted weighted average common shares outstanding	25,974,412	26,029,359	25,965,370	26,034,122
Earnings per share
Net earnings - basic	$ 0.25	$ 0.37	$ 0.41	$ 0.74
Net earnings - diluted	0.25	0.37	0.41	0.74
Cash dividends	$ 0.225	$ 0.225	$ 0.450	$ 0.450