STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($)	12 Months Ended
Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested restricted stock and RSUs retained to cover the the minimum required statutory amount of withholding taxes (Shares)	147,335	175,176	203,383
Unrecognized share-based compensation cost	$ 13,400,000
Unrecognized compensation cost, recognition period	2 years 8 months 12 days
Shares available for grant	2,025,714
Proceeds from option exercises	$ 1,283,000	$ 718,000	$ 3,928,000
Aggregate fair value of options exercised and vested restricted stock-based awards	9,078,000	9,900,000	17,532,000
Excess tax deductions from option exercises and vested restricted stock-based awards	$ 4,531,000	$ 6,515,000	$ 12,781,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Vesting period	4 years
Weighted average fair value of stock options granted	$ 9.39	$ 11.02	$ 9.43
Weighted average remaining contractual term of outstanding options	4 years 8 months 12 days
Aggregate intrinsic value of outstanding options	$ 9,700,000
Weighted average remaining contractual term of exercisable options	3 years 8 months 12 days
Aggregate intrinsic value of exercisable options	$ 9,400,000
Options exercised upon net share settlement			62,899
Options retained by the company to cover option exercise price			37,417
Restricted Stock Units (Rsus) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of units granted to non-employee directors	20,000
Vesting period	12 months

Maximum number of shares available to be given as compensation.

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

The number of options exercised during the period relating to the net share settlement transaction.

+ References

No definition available.

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The number of options retained by the company in the net settlement transaction to cover the option exercise price.

+ References

No definition available.

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- Definition

Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (j)
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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

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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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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- Definition

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.

+ References

No definition available.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

+ References

No definition available.

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