Stock Compensation (Details Textual) (USD $)	12 Months Ended
Feb. 28, 2014 share_based_compensation_plan	Feb. 28, 2013	Feb. 29, 2012
Share Based Compensation (Textual) [Abstract]
Number of share-based compensation plans	1
Shares authorized (shares)	5,000,000
Share for future issuance (shares)	588,491
Total intrinsic value of options exercised	$ 3,600,000
Unrecognized compensation cost	2,900,000
Unrecongized compensation cost, amortization period	2 years 5 months 28 days
Proceeds from Stock Options Exercised	0	15,781	48
Tax benefit from stock options exercised	1,601,991	1,283,240	199,427
Employee Stock Purchase Plan [Member]
Share Based Compensation (Textual) [Abstract]
Term of offering under stock purchase plan	24 months
Granted option lower than	85.00%
Restricted common stock under plan	25,000
Common stock purchased during period (shares)	5,000
Shares expected to be issued (shares)	47,982	76,047	31,106
Directors Grants [Member]
Share Based Compensation (Textual) [Abstract]
Number of independent directors to whom stock granted	7
Shares of company common stock (shares)	2,000	1,000	1,000
Value of common stock grants (usd per share)	$ 36.70	$ 32.51	$ 25.42
Restricted Stock Units (RSUs) [Member]
Share Based Compensation (Textual) [Abstract]
Vesting ratably term	3 years
Total fair value of vested shares	1,900,000	535,018	145,686
Non-vested shares outstanding (shares)	70,352	109,430	122,450
Non-vested shares outstanding, weighted average grant date fair value (usd per share)	$ 45.96	$ 20.73	$ 13.890
Stock Appreciation Rights SARS and Stock Option [Member]
Share Based Compensation (Textual) [Abstract]
Vesting ratably term	3 years
Term for the contract	7 years
Outstanding average contractual term	4 years 4 months 18 days
Outstanding aggregate intrinsic value	17,600,000
Average remaining contractual term	3 years 0 months 2 days
Aggregate remaining intrinsic value	$ 6,800,000

Maximum value of common stock participants have rights to purchase.

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Number of independent directors to whom stock granted.

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Number Of Share-Based Compensation Plans

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Share-based Compensation Arrangement, By Share-based Payment Award, Common Shares Estimated To Be Issued

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Share based compensation arrangement by share based payment award equity instruments options and other than options outstanding weighted average remaining contractual terms.

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Share based compensation arrangement by share based payment award options and other than options exercisable intrinsic value1.

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Share based compensation arrangement by share based payment award options and other than options outstanding intrinsic value.

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Share based compensation arrangement by share based payment award options other than options exercisable weighted average remaining contractual term one.

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Term of offering under stock purchase plan.

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Aggregate number of common shares reserved for future issuance.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The highest quantity of shares an employee can purchase under the plan per period.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Purchase price of common stock expressed as a percentage of its fair market value.

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