Earnings (loss) per Share - Computation for Basic and Diluted Earnings per Share (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	25,673,824	25,684,026	25,802,658	25,665,069
Effect of dilutive options	9,789	44,118	15,488	27,861
Diluted weighted average common shares outstanding	25,683,613	25,728,144	25,818,146	25,692,930
Earnings (loss) per share - basic
Earnings per share on continuing operations	$ 0.22	$ 0.34	$ 0.74	$ 1.05
Earnings per share on discontinued operations		0.08	0.10	0.15
Loss per share on sale of discontinued operations			(1.01)
Earnings (loss) on discontinued operations		0.08	(0.91)	0.15
Net earnings (loss)	0.22	0.42	(0.17)	1.20
Earnings (loss) per share - diluted
Earnings per share on continuing operations	0.22	0.33	0.74	1.05
Earnings per share on discontinued operations		0.08	0.10	0.15
Loss per share on sale of discontinued operations		0.08	(0.91)	0.15
Earnings (loss) on discontinued operations		0.08	(0.91)	0.15
Net earnings (loss)	0.22	0.41	(0.17)	1.20
Cash dividends	$ 0.175	$ 0.175	$ 2.025	$ 0.525