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FINANCING ARRANGEMENTS (Details)		1 Months Ended	3 Months Ended
FINANCING ARRANGEMENTS (Details)	Mar. 30, 2018 USD ($)	Jul. 31, 2018 USD ($) $ / shares shares	May 31, 2020 USD ($)	May 31, 2019 USD ($)	May 15, 2020 USD ($)	Feb. 29, 2020 USD ($)	Apr. 12, 2019 USD ($)
Debt Instrument [Line Items]
Remaining principal amount			$ 262,627,000			$ 271,970,000
Synovia Solutions LLC (“Synovia”) [Member]
Debt Instrument [Line Items]
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			100,000	$ 100,000
Revenue recognized from arrangements with financial institutions			$ 1,700,000	$ 1,100,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maturity date			Mar. 30, 2022
Remaining principal amount			$ 20,000,000
Maximum borrowing capacity	$ 50,000,000
Maturity date	Mar. 30, 2022
Credit facility bear interest			highest of (i) 0%, (ii) the rate of interest publicly announced by JP Morgan Chase Bank, N.A. (the “Agent”) as its prime rate in effect at its principal office in New York City, (iii) the overnight bank funding rate as determined by the Federal Reserve Bank of New York plus 0.50% and (iv) the LIBOR-based rate for a one-month interest period on such day plus 1%; or (b) for Eurodollar loans, the higher of (x) 1.00% and (y) the LIBOR-based rate for one, three or six months (as selected by the Company) for Eurodollar deposits. An applicable margin is added based on the Company’s senior leverage ratio, ranging from 1.50% to 2.00% for base rate loans, and from 2.50% to 3.00% for Eurodollar loans. We will also pay a commitment fee based on our senior leverage ratio ranging from 0.40% to 0.50%, payable quarterly in arrears, on the average daily unused amount of the Credit Facility
Credit facility interest rate			0.00%
Borrowings outstanding			$ 20,000,000
Revolving Credit Facility \| Federal Home Loan Bank Of New York [Member]
Debt Instrument [Line Items]
Variable interest rate			0.50%
Revolving Credit Facility \| LIBOR [Member]
Debt Instrument [Line Items]
Variable interest rate			1.00%
Description of variable rate basis			LIBOR-based rate for one, three or six months
Revolving Credit Facility \| Eurodollar [Member]
Debt Instrument [Line Items]
Variable interest rate			1.00%
Revolving Credit Facility \| Minimum [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Senior leverage ratio			2.50%
Revolving Credit Facility \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Senior leverage ratio			1.50%
Revolving Credit Facility \| Minimum [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Senior leverage ratio			0.40%
Revolving Credit Facility \| Maximum [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Senior leverage ratio			3.00%
Revolving Credit Facility \| Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Senior leverage ratio			2.00%
Revolving Credit Facility \| Maximum [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Senior leverage ratio			0.50%
2025 Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 230,000,000
Maturity date		Aug. 01, 2025
Interest rate (as a percent)		2.00%
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.
Initial conversion price \| $ / shares		$ 30.7450
Number of common stock with hedge transactions \| shares		7,480,000
Conversion rate of shares of common stock		41.3875
Payments for notes hedges		$ 21,200,000
Purchase of note hedges, net of tax		15,900,000
2025 Convertible Notes [Member] \| Additional Paid-in Capital [Member]
Debt Instrument [Line Items]
Notes charge, equity component		$ 51,900,000
2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)					1.625%
Remaining principal amount					$ 27,600,000
2025 Convertible Notes [Member]
Debt Instrument [Line Items]
Fair value of convertible notes			$ 164,000,000			$ 197,000,000