Earnings Per Share - Computation for Basic and Diluted Earnings Per Share (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	25,684,026	25,753,345	25,665,069	25,926,157
Effect of dilutive options	44,118		27,861
Diluted weighted average common shares outstanding	25,728,144	25,753,345	25,692,930	25,926,157
Per share amounts:
Net earnings (loss) - basic	$ 0.42	$ (2.76)	$ 1.20	$ (2.05)
Net earnings (loss) - diluted	0.41	(2.76)	1.20	(2.05)
Cash dividends	$ 0.175	$ 0.175	$ 0.525	$ 0.525