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TREASURY STOCK (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended 23 Months Ended 33 Months Ended
Feb. 02, 2018
USD ($)
shares
Feb. 01, 2018
USD ($)
dealer
Sep. 30, 2018
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Aug. 31, 2018
$ / shares
shares
Mar. 31, 2018
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
shares
Jan. 16, 2018
shares
Oct. 24, 2017
shares
May 19, 2015
shares
Equity, Class of Treasury Stock [Line Items]                        
Stock authorized to repurchase under stock repurchase program (in shares)                   25,000,000    
Shares repurchased during the period, value | $       $ 100,000 $ 0              
Restricted stock units                        
Equity, Class of Treasury Stock [Line Items]                        
Shares paid for tax withholding (in shares)       500,093 371,726              
Cost related to tax withholding | $       $ 11,400 $ 9,900              
Senior secured revolving credit facility | Line of credit                        
Equity, Class of Treasury Stock [Line Items]                        
Amount borrowed for repurchase | $   $ 300,000   $ 450,000       $ 450,000        
Share repurchase program, May 2015                        
Equity, Class of Treasury Stock [Line Items]                        
Stock authorized to repurchase under stock repurchase program (in shares)                       20,000,000
Shares repurchased during the period (in shares)             970,650   20,000,000      
Shares repurchased during the period, value | $             $ 27,600   $ 607,600      
Stock remaining to be purchased (in shares)             0   0      
Share repurchase program, October 2017                        
Equity, Class of Treasury Stock [Line Items]                        
Stock authorized to repurchase under stock repurchase program (in shares)                     25,000,000  
Shares repurchased during the period (in shares)       4,160,836     6,417,212 14,801,246        
Shares repurchased during the period, value | $       $ 100,000     $ 182,400 $ 393,700        
ASR Agreements                        
Equity, Class of Treasury Stock [Line Items]                        
Shares repurchased during the period (in shares) 7,387,862   7,400,000   3,679,947 11,067,809            
Shares repurchased during the period, value | $   $ 300,000     $ 96,800              
Stock remaining to be purchased (in shares)       10,198,754       10,198,754        
Stock repurchase program, number of dealers | dealer   2                    
Number of shares acquired from each of dealers (in shares) 3,693,931                      
Percentage of total number of shares expected to be repurchased 70.00%                      
Shares repurchased during the period, average cost per share (in dollars per share) | $ / shares           $ 27.11            
ASR Agreements | Dealer one                        
Equity, Class of Treasury Stock [Line Items]                        
Shares repurchased during the period, value | $ $ 150,000                      
ASR Agreements | Dealer two                        
Equity, Class of Treasury Stock [Line Items]                        
Shares repurchased during the period, value | $ $ 150,000