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STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Summary of Activity Relating to Restricted Stock Units (Details) - Restricted stock units - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Shares        
Nonvested, beginning balance (shares)     1,765  
Granted (shares)     1,242  
Vested (shares)     (662)  
Forfeited (shares)     (230)  
Nonvested, ending balance (shares) 2,115   2,115  
Weighted-Average Grant Date Fair Value Per Share        
Nonvested, beginning balance (usd per share)     $ 6.75  
Granted (usd per share) $ 7.53 $ 3.36 7.55 $ 3.44
Vested (usd per share)     7.71  
Forfeited (usd per share)     6.92  
Nonvested, ending balance (usd per share) $ 6.90   $ 6.90