Earnings (Loss) Per Share - Computation for Basic and Diluted Earnings (Loss) Per Share (Detail) - $ / shares	3 Months Ended								12 Months Ended
	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding									25,688,273	25,864,352	26,125,348
Effect of dilutive options									34,094		20,977
Diluted weighted average common shares outstanding									25,722,367	25,864,352	26,146,325
Per share amounts:
Net earnings (loss) - basic	$ 0.19	$ 0.42	$ 0.43	$ 0.36	$ 0.34	$ (2.76)	$ 0.39	$ 0.31	$ 1.39	$ (1.72)	$ 0.50
Net earnings (loss) - diluted	0.19	0.41	0.43	0.36	0.34	(2.76)	0.39	0.31	1.39	(1.72)	0.50
Cash dividends	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.700	$ 0.700	$ 0.525