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ORGANIZATION AND BASIS OF PRESENTATION - Basis of Presentation (Narrative) (Details)
shares in Millions
3 Months Ended 12 Months Ended
Oct. 01, 2013
Sep. 30, 2019
shares
Jun. 30, 2019
Noncontrolling Interest [Line Items]      
General partner interest (as a percent)   50.10% 49.00%
Class B common units      
Noncontrolling Interest [Line Items]      
Exchange agreement, conversion ratio 0.1429    
Unit of partnership, conversion ratio 1    
Exchanged for cash | Class B common units      
Noncontrolling Interest [Line Items]      
Class B common units and associated Class B common shares exchanged (in shares)   1.3  
Exchanged for Class A common stock | Class B common units      
Noncontrolling Interest [Line Items]      
Shares retired (in shares)   1.3  
Premier LP      
Noncontrolling Interest [Line Items]      
Limited partners ownership interest (as a percent)   49.90% 51.00%