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Earnings Per Share - Computation for Basic and Diluted Earnings Per Share (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2015	Aug. 31, 2014
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	25,662,828	25,990,496	25,636,203	25,991,444
Effect of dilutive options	30,428	12,205	21,316	13,105
Diluted weighted average common shares outstanding	25,693,256	26,002,701	25,657,519	26,004,549
Per share amounts:
Net earnings - basic	$ 0.43	$ 0.39	$ 0.79	$ 0.69
Net earnings - diluted	0.43	0.39	0.79	0.69
Cash dividends	$ 0.175	$ 0.175	$ 0.350	$ 0.350

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Income Loss Per Share [Abstract]

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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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