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BUSINESS ACQUISITIONS (Textuals) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 20, 2018
Nov. 22, 2017
Oct. 27, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]              
Share price (in dollars per share) $ 6.81            
Transaction related fees       $ 3,898,000 $ 0 $ 3,898,000 $ 0
Aegis              
Business Acquisition [Line Items]              
Cash consideration $ 2,000,000            
Consideration transferred $ 142,286,000            
Aegis | Common Stock              
Business Acquisition [Line Items]              
Business acquisition, share price (in dollars per share) $ 12            
Cash consideration $ 2,000,000            
ESM              
Business Acquisition [Line Items]              
Cash consideration   $ 153,910,000          
Consideration transferred   $ 280,000,000          
Term loan              
Business Acquisition [Line Items]              
Face amount of debt     $ 140,000,000        
Debt term     5 years        
Aegis Stockholder | Aegis | Common Stock              
Business Acquisition [Line Items]              
Business acquisition, number of shares (in shares) 20,600,000            
Ownership by Aegis Stockholder, shares 20,766,667            
Ownership by Aegis Stockholder, percentage 55.00%