Earnings (loss) per Share - Computation for Basic and Diluted Earnings per Share (Detail) - $ / shares	3 Months Ended	6 Months Ended
Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	25,893,218	25,662,828	25,847,051	25,636,203
Effect of dilutive options	17,157	30,428	21,748	21,316
Diluted weighted average common shares outstanding	25,910,375	25,693,256	25,868,799	25,657,519
Earnings (loss) per share - basic and diluted
Earnings per share on continuing operations	$ 0.26	$ 0.37	$ 0.52	$ 0.72
Earnings per share on discontinued operations		0.06	0.10	0.07
Loss per share on sale of discontinued operations			(1.01)
Earnings (loss) on discontinued operations		0.06	(0.91)	0.07
Net earnings (loss)	0.26	0.43	(0.39)	0.79
Cash dividends	$ 1.675	$ 0.175	$ 1.850	$ 0.350

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Per basic and diluted share amount, after tax, of the gain (loss) on the disposal of discontinued operations, when the per share amount is the same.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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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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