FINANCING ARRANGEMENTS (Details)						1 Months Ended			3 Months Ended		12 Months Ended
	Apr. 16, 2020 USD ($)	Jul. 28, 2018 USD ($)	Jul. 20, 2018 USD ($)	Mar. 30, 2018 USD ($)	May 28, 2015 USD ($)	Nov. 30, 2019 USD ($)	Jul. 31, 2018 USD ($) shares	May 31, 2015 USD ($)	Nov. 30, 2019 USD ($)	Aug. 31, 2018 USD ($)	Feb. 29, 2020 USD ($) Note	Feb. 28, 2019 USD ($)	Apr. 12, 2019 USD ($)
Debt Instrument [Line Items]
Fair value of convertible notes											$ 225,000,000	$ 303,000,000
Loss on extinguishment of debt									$ (2,400,000)	$ (2,000,000)	(2,408,000)	(2,033,000)
Repurchase of common stock												$ 49,000,000
Synovia Solutions LLC (“Synovia”) [Member]
Debt Instrument [Line Items]
Percentage of subscription contract value on sales price paid													80.00%
Fair value of debt													$ 19,700,000
Pre-tax cost of debt percentage													4.70%
Unamortized discount													$ 1,500,000
Interest expense related to debt recognized											700,000
Non-cash revenue recognized from arrangements with financial institutions											$ 6,800,000
Convertible Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Number of outstanding convertible senior unsecured notes | Note											2
2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Fair value of convertible notes			$ 47,600,000
Aggregate principal amount											$ 27,600,000
Debt instrument, face amount								$ 172,500,000
Fixed interest rate								1.625%
Maturity date								May 15, 2020
Aggregate amount of notes repurchase			50,000,000			$ 94,900,000			$ 94,900,000
Repurchases of notes including accrued interest			53,800,000			94,700,000
Allocated notes repurchase price			53,700,000
Notes repurchase price, equity component			6,100,000
Carrying value of repurchased notes			45,600,000			92,300,000
Loss on extinguishment of debt			(2,000,000)			(2,400,000)
Fair value of the liability						$ 94,700,000
Issuance costs					$ 4,300,000
Conversion rate of shares of common stock					36.2398
2020 Convertible Notes [Member] | Additional Paid in Capital [Member]
Debt Instrument [Line Items]
Proceeds from unwind of the note hedge and warrants			$ 3,100,000
2020 Convertible Notes [Member] | Discount Rate [Member]
Debt Instrument [Line Items]
Market interest rate used to discount nonconvertible debt			0.0436
2025 Convertible Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount											$ 230,000,000
Debt instrument, face amount			$ 230,000,000
Fixed interest rate			2.00%
Maturity date			Aug. 01, 2025
Proceeds from sale of notes			$ 222,700,000
Issuance costs		$ 7,300,000	7,300,000
Amount utilized from net proceeds of offering			90,000,000
Purchase of note hedges, net of tax			21,200,000				$ 15,900,000
Repurchase of common stock			15,000,000
Indebtedness for excess money borrowed			10,000,000
Indebtedness, entry of judgments for payment			$ 15,000,000
Debt instrument, covenant description											The 2025 Indenture contains customary terms and conditions, including that upon certain events of default occurring and continuing, either the trustee, by notice to us, or the holders of at least 25% in aggregate principal amount of the then outstanding Notes, by notice to us and the trustee, may declare the principal amount of, and all accrued and unpaid interest on, all of the 2025 Convertible Notes then outstanding to become due and payable immediately. Such events of default include, without limitation, the default by us or any of our subsidiaries with respect to indebtedness for borrowed money in excess of $10 million and the entry of judgments for the payment of $15 million or more against us or any of our subsidiaries, which are not paid, discharged or stayed within 60 days.
Debt instrument, redemption, description											We may redeem the Notes at our option at any time on or after August 6, 2022 at a cash redemption price equal to the principal amount plus accrued interest, but only if the last reported sale price per share of our stock exceeds 130% of the conversion price on (i) each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the trading day immediately before the date we send the related redemption notice; and (ii) the trading day immediately before the date we send such notice.
Number of common stock with hedge transactions | shares							7,480,000
Conversion rate of shares of common stock		32.5256					41.3875
Payments for notes hedges							$ 21,200,000
2025 Convertible Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, default judgment payment period			60 days
Paycheck Protection Program [Member] | JPMorgan Chase Bank, N.A [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Proceeds from loan amount	$ 10,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 50,000,000
Maturity date				Mar. 30, 2022
Borrowings outstanding											$ 0