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EQUITY AND CONVERTIBLE PREFERRED STOCK - Treasury Stock - Share Repurchase Program (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019 | Feb. 03, 2016
Class of Stock [Line Items] |  |  |  |
Treasury stock acquired during the period |  | $ 4,500,000 |  |
Incremental Repurchase Program |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury stock acquired during the period | $ 0 | $ 0 | $ 0 |
Incremental Repurchase Program | Common Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock repurchase program, authorized amount |  |  |  | $ 500,000,000.0
Amount remaining under current repurchase program | $ 396,800,000 |  |  |

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