Earnings Per Share - Computation for Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended	6 Months Ended
Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	26,102,129	25,992,505	26,078,188	25,984,188
Effect of dilutive options	26,526	18,638	20,232	19,395
Diluted weighted average common shares outstanding	26,128,655	26,011,143	26,098,420	26,003,583
Per share amounts:
Net earnings - basic	$ 0.38	$ 0.29	$ 0.70	$ 0.44
Net earnings - diluted	$ 0.38	$ 0.29	$ 0.70	$ 0.44
Cash dividends	$ 0.175	$ 0.175	$ 0.175	$ 0.350

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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