Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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DEBT - CONVERTIBLE DEBT INFORMATION (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Jun. 18, 2013	Nov. 16, 2011
Debt Instrument [Line Items]
Principal amount of Convertible Notes	$ 268,149
1.75% Convertible Notes due 2016
Debt Instrument [Line Items]
Interest rate	1.75%
1.00% Convertible Notes due 2018
Debt Instrument [Line Items]
Interest rate	1.00%
Additional paid-in capital	$ 35,784	$ 35,784
Principal amount of Convertible Notes		287,500
Unamortized discount of the liability component	15,751	29,972
Carrying amount of debt issuance costs	469	922
Net carrying amount of Convertible Notes	$ 251,929	256,606
Convertible Debt \| 1.75% Convertible Notes due 2016
Debt Instrument [Line Items]
Interest rate	1.75%			1.75%
Additional paid-in capital	$ 0	51,180
Principal amount of Convertible Notes	0	250,000
Unamortized discount of the liability component	0	8,014
Carrying amount of debt issuance costs	0	657
Net carrying amount of Convertible Notes	$ 0	$ 241,329
Convertible Debt \| 1.00% Convertible Notes due 2018
Debt Instrument [Line Items]
Interest rate	1.00%		1.00%