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SHARE REPURCHASE PROGRAM (Details) - USD ($)
$ in Thousands
2 Months Ended 12 Months Ended
May 17, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
SHARE REPURCHASE          
Number of shares authorized to be repurchased   14,217,683      
Repurchased common stock   $ 154,792   $ 26,552  
Common Stock | Share Repurchase Program          
SHARE REPURCHASE          
Repurchased common stock (in shares)   1,512,557 0 953,647  
Repurchased common stock   $ 154,808 $ 0 $ 26,552  
Commissions   $ 16 $ 0   $ 10
Shares repurchased under the share repurchase program   6,683,887      
Number of shares of common stock remaining available for repurchase under the entity's share repurchase authorization   7,533,796      
Subsequent Event | Common Stock | Share Repurchase Program          
SHARE REPURCHASE          
Repurchased common stock (in shares) 1,597,216        
Repurchased common stock $ 153,515        
Commissions $ 16        
Number of shares of common stock remaining available for repurchase under the entity's share repurchase authorization 5,936,580