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ORGANIZATION AND BASIS OF PRESENTATION - Organization (Narrative) (Details)
3 Months Ended 12 Months Ended
Jul. 31, 2019
Sep. 30, 2019
category
segment
Jun. 30, 2019
Segment Reporting Information [Line Items]      
Number of business segments | segment   2  
General partner interest (as a percent)   50.10% 49.00%
Premier LP      
Segment Reporting Information [Line Items]      
Limited partners ownership interest (as a percent)   49.90% 51.00%
Performance services segment      
Segment Reporting Information [Line Items]      
Number of main categories | category   3  
Class A Common Stock      
Segment Reporting Information [Line Items]      
Limited partners ownership interest (as a percent) 50.20%    
Class B Common Stock      
Segment Reporting Information [Line Items]      
Limited partners ownership interest (as a percent) 49.80%