NET INCOME (LOSS) PER SHARE - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Oct. 31, 2012	Nov. 15, 2010	Jun. 30, 2009
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrant Expiration Date From Date of Issuance	7 years
Warrant Expiration Date, After Change of Control	3 years
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from anti-dilutive shares excluded from computations (in shares)	4.5	2.4	12.8
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from anti-dilutive shares excluded from computations (in shares)	12.1	0.1	11.0
EMC Corporation
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of shares called by warrants (in shares)						10.0
Exercise price (usd per share)						$ 0.38
3.50% Convertible Subordinated Debt
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stated interest rate (as a percent)	3.50%	3.50%	3.50%
Conversion price (usd per share)	$ 4.33	$ 4.33	$ 4.33		$ 4.33
Anti-dilutive shares excluded from anti-dilutive shares excluded from computations (in shares)	10.0	29.0	31.1
Anti-dilutive income excluded from computations	$ 1.8	$ 5.3	$ 5.7
4.50% Convertible Subordinated Debt
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stated interest rate (as a percent)	4.50%	4.50%	4.50%
Conversion price (usd per share)	$ 1.65	$ 1.65	$ 1.65	$ 1.65
Anti-dilutive shares excluded from anti-dilutive shares excluded from computations (in shares)	42.5	42.5	42.5
Anti-dilutive income excluded from computations	$ 3.6	$ 3.6	$ 3.6