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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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 share based payment arrangements using the treasury stock method.

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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	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
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio										2
Numerator:
Net income	$ 16,283us-gaap_NetIncomeLoss	$ 19,965us-gaap_NetIncomeLoss	$ 13,769us-gaap_NetIncomeLoss	$ 14,925us-gaap_NetIncomeLoss	$ 10,242us-gaap_NetIncomeLoss	$ 18,445us-gaap_NetIncomeLoss	$ 16,363us-gaap_NetIncomeLoss	$ 14,547us-gaap_NetIncomeLoss	$ 64,943us-gaap_NetIncomeLoss	$ 59,597us-gaap_NetIncomeLoss	$ 60,456us-gaap_NetIncomeLoss
Denominator:
Denominator for basic earnings per common share-weighted average shares (shares)									25,675,645	25,514,387	25,320,147
Effect of dilutive securities:
Employee and Director stock awards (shares)									102,300	179,081	240,447
Denominator for diluted earnings per common share (shares)									25,777,945	25,693,468	25,560,594
Earnings per share basic and diluted:
Basic earnings per common share (usd per share)	$ 0.63us-gaap_EarningsPerShareBasic	$ 0.78us-gaap_EarningsPerShareBasic	$ 0.54us-gaap_EarningsPerShareBasic	$ 0.58us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic	$ 0.64us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic	$ 2.53us-gaap_EarningsPerShareBasic	$ 2.34us-gaap_EarningsPerShareBasic	$ 2.39us-gaap_EarningsPerShareBasic
Diluted earnings per common share (usd per share)	$ 0.63us-gaap_EarningsPerShareDiluted	$ 0.77us-gaap_EarningsPerShareDiluted	$ 0.53us-gaap_EarningsPerShareDiluted	$ 0.58us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.64us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ 2.52us-gaap_EarningsPerShareDiluted	$ 2.32us-gaap_EarningsPerShareDiluted	$ 2.37us-gaap_EarningsPerShareDiluted
Stock Appreciation Rights (SARs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									80,683	113,887	0