Stock based compensation.

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- Definition

Stock repurchase program additional authorized amount.

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- Definition

Stock repurchase program authorized amount utilized.

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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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- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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- Definition

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

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- Definition

Amount of stock repurchase plan authorized.

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- Definition

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount remaining of a stock repurchase plan authorized.

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- Definition

Number of shares that have been repurchased and retired during the period.

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($)			3 Months Ended	6 Months Ended
	Jun. 07, 2018	May 07, 2018	Aug. 31, 2018	Aug. 31, 2018	Jul. 16, 2018
Stock Based Compensation [Line Items]
Stock repurchase program, authorized amount		$ 30,000,000			$ 39,000,000
Stock repurchase program, additional authorized amount					$ 9,000,000
Share repurchase program period		12 months
Number of shares repurchased			1,000,000
Average cost per share			$ 23.20
Stock repurchased cost			$ 22,900,000	$ 28,564,000
Proceeds from sale of notes				230,000,000
Stock repurchase program, authorized amount utilized			28,600,000	28,600,000
Remaining authorized amount available to repurchase shares			10,400,000	10,400,000
Issuance of common stock under ESPP	1,750,000
Unrecognized share-based compensation cost			31,700,000	$ 31,700,000
Unrecognized compensation cost, recognition period				3 years 3 months 18 days
2025 Convertible Notes [Member]
Stock Based Compensation [Line Items]
Proceeds from sale of notes			$ 15,000,000