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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% |  |

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