Quarterly report pursuant to Section 13 or 15(d)

NET INCOME (LOSS) PER SHARE - Anti-dilutive shares excluded from the computations of diluted net income (loss) (Details)

v3.7.0.1
NET INCOME (LOSS) PER SHARE - Anti-dilutive shares excluded from the computations of diluted net income (loss) (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2012
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average shares excluded (shares) 0.2 0.5  
Unvested restricted stock units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average shares excluded (shares) 1.5 1.4  
4.50% convertible subordinated notes      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average shares excluded (shares) 4.8 5.3  
Interest expense excluded $ 0.8 $ 0.9  
Stated interest rate 4.50%   4.50%