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REDEEMABLE LIMITED PARTNERS' CAPITAL - Narrative (Details)
$ in Thousands, shares in Millions
3 Months Ended 12 Months Ended
Oct. 01, 2013
Sep. 30, 2019
USD ($)
limited_partner
shares
Sep. 30, 2018
USD ($)
Jun. 30, 2019
Class B common units        
Temporary Equity [Line Items]        
Exchange agreement, conversion ratio 0.1429      
Exchanged for cash | Class B common units        
Temporary Equity [Line Items]        
Reduction in Redeemable Limited Partners' Capital   $ 50,800    
Exchange of Class B units for Class A common stock by member owners (in shares) | shares   1.3    
Promissory note        
Temporary Equity [Line Items]        
Promissory note for which common units are not eligible for exchange, term   5 years    
Five-year, unsecured, non-interest bearing term promissory note | Promissory note        
Temporary Equity [Line Items]        
Promissory note for which common units are not eligible for exchange, term   5 years    
Limited partner        
Temporary Equity [Line Items]        
Adjustment to fair value for the redemption amount   $ 694,309 $ (708,193)  
Number of limited partners withdrawing from partnership | limited_partner   3    
Redeemable limited partners' capital | Limited partner        
Temporary Equity [Line Items]        
Adjustment to fair value for the redemption amount   $ 694,309 $ (708,193)  
Premier LP        
Temporary Equity [Line Items]        
Limited partners ownership (as a percent)   49.90%   51.00%