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COMMON STOCK AND TREASURY STOCK - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 28, 2014
Sep. 30, 2014
Feb. 28, 2015
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Mar. 03, 2017
Aug. 03, 2016
May 04, 2016
Class of Stock [Line Items]                          
Common stock, shares authorized (in shares)       500,000,000   500,000,000   500,000,000 500,000,000        
Common stock, shares outstanding (in shares)       80,275,965   81,667,129   80,275,965 81,667,129        
Treasury stock, shares retired (in shares)     44,768,739                    
Treasury stock, value of retired stock     $ 138,900,000             $ 0      
Dividend declared (in dollars per share)   $ 0.17           $ 0 $ 0 $ 0.17      
Dividend paid $ 15,000,000             $ 0 $ 0 $ 15,020,000      
Common Stock                          
Class of Stock [Line Items]                          
Treasury stock, shares retired (in shares)                   0      
Stock repurchase program one                          
Class of Stock [Line Items]                          
Total number of shares purchased (in shares)           1,309,606              
Value of total number of shares purchased           $ 50,000,000              
Stock repurchase cost incurred but not yet paid                 $ 6,500,000        
Stock repurchase program one | Common Stock                          
Class of Stock [Line Items]                          
Repurchase of common stock                         $ 50,000,000
Average price paid per share (in dollars per share)           $ 38.18              
Stock repurchase program two                          
Class of Stock [Line Items]                          
Total number of shares purchased (in shares)         1,014,956                
Average price paid per share (in dollars per share)         $ 49.26                
Value of total number of shares purchased         $ 50,000,000                
Stock repurchase program two | Common Stock                          
Class of Stock [Line Items]                          
Repurchase of common stock                       $ 50,000,000  
Stock repurchase program three                          
Class of Stock [Line Items]                          
Total number of shares purchased (in shares)       50,000 917,455                
Value of total number of shares purchased       $ 2,500,000                  
Stock repurchase cost incurred but not yet paid             $ 3,000,000            
Stock repurchase program three | Common Stock                          
Class of Stock [Line Items]                          
Repurchase of common stock         $ 46,300,000   46,300,000       $ 50,000,000    
Average price paid per share (in dollars per share)       $ 49.55 $ 50.43                
Remaining authorized repurchase amount         $ 1,300,000   $ 1,300,000