Share-Based Compensation Plans (Details) (USD $)	3 Months Ended
May 31, 2014 item	May 31, 2013
Share-Based Compensation Plans
Number of expired share-based compensation plans	2
Number of active share-based compensation plans	3
SHARE-BASED PAYMENT EXPENSE
Less income tax benefits	$ (127,000)	$ (723,000)
Share-based payment expense, net of income tax benefits	1,243,000	2,696,000
Earnings per share impact of share-based payment expense:
Basic (in dollars per share)	$ 0.04	$ 0.08
Diluted (in dollars per share)	$ 0.04	$ 0.08
SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	1,369,000	3,419,000
Employee stock options
Share-based compensation plans
Options granted (in shares)	231,500
Exercise price per share (in dollars per share)	$ 64.19
Range of risk free interest rates used, minimum (as a percent)	1.28%
Range of risk free interest rates used, maximum (as a percent)	1.40%
Dividend yield (as a percent)	0.00%
Range of expected volatility rates used, minimum (as a percent)	48.38%
Range of expected volatility rates used, maximum (as a percent)	48.51%
Stock options exercised (in shares)	72,969
Employee stock options \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	704,000	589,000
Employee stock options \| Minimum
Share-based compensation plans
Fair value for grants (in dollars per share)	$ 25.03
Term of award	4 years
Expected lives	4 years 18 days
Employee stock options \| Maximum
Share-based compensation plans
Fair value for grants (in dollars per share)	$ 26.05
Term of award	5 years
Expected lives	4 years 4 months 6 days
Stock compensation \| Directors \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	247,000	137,000
Performance-based and other stock awards \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	418,000	2,693,000
Restricted stock awards \| Directors
Share-based compensation plans
Granted, issued or earned, Awards issued or earned (in shares)	2,628
Grant date fair value	$ 170,000
Grant date fair value (in dollars per share)	$ 65.99
Restricted stock awards \| 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
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
Directors stock options
Share-based compensation plans
Stock options exercised (in shares)	20,000
Performance-based stock awards \| Former CEO
Share-based compensation plans
Number of shares withheld for the federal tax obligations	68,086

Represents the number of active share-based compensation plans of the entity.

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Represents the number of expired share-based compensation plans of the entity.

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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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No definition available.

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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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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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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- Definition

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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- Definition

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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- Definition

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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- Definition

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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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-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.

+ References

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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- Definition

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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- Definition

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

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No definition available.

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- Definition

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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-Name Accounting Standards Codification

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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- Definition

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

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

-Publisher SEC

-Name Regulation S-X (SX)

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-Section 04

-Article 3

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