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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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Per share weighted average intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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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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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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No definition available.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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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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Share-Based Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Nov. 30, 2017	May 31, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
SHARE-BASED PAYMENT EXPENSE
Less income tax benefits	$ (781)		$ (706)	$ (1,862)	$ (2,920)
Share-based payment expense, net of income tax benefits	$ 3,923		$ 2,249	$ 9,440	$ 8,897
Earnings per share impact of share-based payment expense:
Basic (in dollars per share)	$ 0.14		$ 0.08	$ 0.35	$ 0.32
Diluted (in dollars per share)	$ 0.14		$ 0.08	$ 0.35	$ 0.32
SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	$ 4,704		$ 2,955	$ 11,302	$ 11,817
Employee stock options
Share-based compensation plans
Exercise of stock options (in shares)	7,148			110,552
Restricted stock (RSA) \| Directors
Share-based compensation plans
Number of awards granted (in shares)	1,351			4,279
Grant date fair value	$ 100			$ 400
Grant date fair value (in dollars per share)				$ 94.26
Share-based compensation. \| Directors \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	175		175	$ 575	525
Performance-based and other stock awards \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	4,202		2,151	9,141	8,998
Employee stock purchase plan \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense				297	258
Stock Option Officers Employees and Consultants \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	$ 327		$ 629	$ 1,289	$ 2,036
Restricted Stock Units (RSU)
Share-based compensation plans
Number of awards granted (in shares)				78,352
Grant date fair value (in dollars per share)	$ 93.75			$ 89.22
Restricted Stock Units (RSU) \| Employees
Share-based compensation plans
Number of awards granted (in shares)	1,115			35,250
Vested and settled or exercised, total grant date fair value	$ 100			$ 3,500
Vested and settled or exercised, fair value (in dollars per share)				$ 98.13
Performance Stock Units (PSU)
Share-based compensation plans
Number of awards granted (in shares)	3,795			70,329
Grant date fair value (in dollars per share)	$ 92.20			$ 91.54
Vested and settled or exercised, Vested and settled (in shares)		149,884
Vested and settled or exercised, total grant date fair value		$ 14,300
Vested and settled or exercised, average share rice (in dollars per share)		$ 95.55