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Earnings Per Share - Computation for Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding									26,125,348	26,035,571	25,946,107
Effect of dilutive options									20,977	17,881	21,570
Diluted weighted average common shares outstanding									26,146,325	26,053,452	25,967,677
Per share amounts:
Net earnings - basic	$ (0.55)	$ 0.36	$ 0.38	$ 0.33	$ 0.27	$ 0.24	$ 0.29	$ 0.15	$ 0.50	$ 0.95	$ 1.21
Net earnings - diluted	$ (0.55)	$ 0.36	$ 0.38	$ 0.33	$ 0.27	$ 0.24	$ 0.29	$ 0.15	$ 0.50	$ 0.95	$ 1.21
Cash dividends	$ 0.175	$ 0.175	$ 0.175		$ 0.350	$ 0.175	$ 0.175	$ 0.175	$ 0.53	$ 0.88	$ 0.62

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Aggregate dividends paid during the period for each share of common stock outstanding.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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