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Earnings (Loss) Per Share - Computation for Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding									25,864,352us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	26,125,348us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	26,035,571us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive options										20,977us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	17,881us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Diluted weighted average common shares outstanding									25,864,352us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	26,146,325us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	26,053,452us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per share amounts:
Net earnings (loss) - basic	$ 0.34us-gaap_EarningsPerShareBasic	$ (2.76)us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ (0.55)us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.38us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ (1.72)us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ 0.95us-gaap_EarningsPerShareBasic
Net earnings (loss) - diluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ (2.76)us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ (0.55)us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ (1.72)us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.95us-gaap_EarningsPerShareDiluted
Cash dividends	$ 0.175us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.175us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.175us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.175us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.175us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.175us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.175us-gaap_CommonStockDividendsPerShareCashPaid		$ 0.70us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.53us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.88us-gaap_CommonStockDividendsPerShareCashPaid

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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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