Earnings Per Share - Computation for Basic and Diluted Earnings Per Share (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	25,974,006	26,010,571	25,978,461	26,034,617
Diluted weighted average common shares outstanding	25,974,006	26,010,571	25,978,461	26,034,617
Earnings per share
Net earnings - basic	$ 0.32	$ 0.41	$ 0.73	$ 1.14
Net earnings - diluted	0.32	0.41	0.73	1.14
Cash dividends	$ 0.225	$ 0.225	$ 0.675	$ 0.675