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

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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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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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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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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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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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 ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Aug. 31, 2016	May 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
SHARE-BASED PAYMENT EXPENSE
Less income tax benefits	$ (693)		$ (274)	$ (2,214)	$ (593)
Share-based payment expense, net of income tax benefits	$ 2,503		$ 1,655	$ 6,648	$ 3,449
Earnings per share impact of share-based payment expense:
Basic (in dollars per share)	$ 0.09		$ 0.06	$ 0.24	$ 0.12
Diluted (in dollars per share)	$ 0.09		$ 0.06	$ 0.24	$ 0.12
SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	$ 3,196		$ 1,929	$ 8,862	$ 4,042
Certain officers and employees
Share-based compensation plans
Options granted (in shares)		1,500
Employee stock options
Share-based compensation plans
Range of risk free interest rates used, minimum (as a percent)		1.22%
Expected dividend rate (as a percent)		0.00%
Range of expected volatility rates used, minimum (as a percent)		33.40%
Exercise of stock options (in shares)	38,032			111,667
Employee stock options \| Minimum
Share-based compensation plans
Fair value for grants (in dollars per share)		$ 28.74
Term of award		4 years
Expected terms used		4 years 18 days
Restricted stock (RSA) \| Directors
Share-based compensation plans
Number of awards granted (in shares)	1,190			2,471
Grant date fair value	$ 120			$ 250
Grant date fair value (in dollars per share)	$ 103.46			$ 99.55
Share-based compensation. \| Directors \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	$ 175		175	$ 350	350
Performance-based and other stock awards \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	$ 2,096		887	$ 6,847	2,132
Employee stock purchase plan
Share-based compensation plans
Shares of common stock acquired by plan participants	14,580			14,580
Purchase price of stock issued under employee stock purchase plan	$ 1,120			$ 1,120
Employee stock purchase plan \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	258		223	258	223
Stock Option Officers Employees and Consultants \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	$ 667		$ 644	$ 1,407	$ 1,337
Restricted Stock Units (RSU)
Share-based compensation plans
Options granted (in shares)	4,650			83,582
Fair value for grants (in dollars per share)	$ 94.58			$ 97.63
Number of awards granted (in shares)		13,231
Grant date fair value		$ 1,270
Grant date fair value (in dollars per share)		$ 95.92
Performance Restricted Stock Units (PSU)
Share-based compensation plans
Options granted (in shares)		139,456
Fair value for grants (in dollars per share)		$ 97.12