FAIR VALUE - Schedule of Carrying Value and Fair Value of Financial Liabilities (Details) - Convertible subordinated debt - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Carrying Value	$ 152,680	$ 152,138
Level 2 fair value measurements
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value	$ 142,811	$ 166,551

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant