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Represents the effect of share-based compensation expenses on the basic earnings per share during the reporting period.

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No definition available.

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Represents the effect of share-based compensation expenses on the diluted earnings per share during the reporting period.

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No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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No definition available.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan 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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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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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-Subsection 2

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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No definition available.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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No definition available.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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No definition available.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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No definition available.

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

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No definition available.

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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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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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No definition available.

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Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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No definition available.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of share options (or share units) exercised during the current period.

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-Name Regulation S-X (SX)

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Share-Based Compensation Plans (Details) (USD $)	3 Months Ended			9 Months Ended		3 Months Ended
Share-Based Compensation Plans (Details) (USD $)	Nov. 30, 2014	Aug. 31, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013	May 31, 2014
Share-based compensation plans
Number of shares withheld for the federal tax obligations	0	0
SHARE-BASED PAYMENT EXPENSE
Less income tax benefits	$ (141,000)		$ (466,000)	$ (514,000)	$ (1,877,000)
Share-based payment expense, net of income tax benefits	1,239,000		1,982,000	4,218,000	7,454,000
Earnings per share impact of share-based payment expense:
Basic (in dollars per share)	$ 0.04		$ 0.06	$ 0.15	$ 0.23
Diluted (in dollars per share)	$ 0.04		$ 0.06	$ 0.15	$ 0.23
Employee stock purchase plan
Share-based compensation plans
Shares of common stock acquired by plan participants				13,848
Stock issued under employee stock purchase plan (in shares)				690,000
SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	1,380,000		2,448,000	4,732,000	9,331,000
Employee stock options
Share-based compensation plans
Options granted (in shares)	7,500			248,000
Range of risk free interest rates used, minimum (as a percent)	1.22%			1.22%
Range of risk free interest rates used, maximum (as a percent)	1.49%			1.49%
Dividend yield (as a percent)	0.00%			0.00%
Range of expected volatility rates used, minimum (as a percent)	41.49%			41.49%
Range of expected volatility rates used, maximum (as a percent)	50.53%			50.53%
Stock options exercised (in shares)	22,292			121,711
Employee stock options \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	869,000		589,000	2,483,000	1,791,000
Employee stock options \| Minimum
Share-based compensation plans
Fair value for grants (in dollars per share)	$ 19.02			$ 19.02
Term of award	4 years			4 years
Expected lives	4 years 18 days			4 years 18 days
Employee stock options \| Maximum
Share-based compensation plans
Fair value for grants (in dollars per share)	$ 26.05			$ 26.05
Term of award	5 years			5 years
Expected lives	4 years 4 months 6 days			4 years 4 months 6 days
Stock compensation \| Directors \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	175,000		151,000	641,000	438,000
Performance-based and other stock awards \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	336,000		1,708,000	1,441,000	6,944,000
Restricted stock units \| Former CEO \| Performance-based
Share-based compensation plans
Vested and settled or exercised, Vested and settled (in shares)						100,000
Vested and settled or exercised, Vested and settled (in dollars per share)						$ 67.10
Restricted stock \| Directors
Share-based compensation plans
Granted, issued or earned, Awards issued or earned (in shares)	2,107			7,363
Grant date fair value	120,000			440,000
Grant date fair value (in dollars per share)	$ 58.22			$ 60.98
Restricted stock \| Former CEO \| Performance-based
Share-based compensation plans
Vested and settled or exercised, Vested and settled (in shares)						62,304
Vested and settled or exercised, Vested and settled (in dollars per share)						$ 67.10
Directors stock options
Share-based compensation plans
Stock options exercised (in shares)	0			20,000
Employee stock purchase plan \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense				$ 167,000	$ 158,000
Performance-based stock awards \| Former CEO
Share-based compensation plans
Number of shares withheld for the federal tax obligations						68,086