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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%

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