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EARNINGS (LOSS) PER SHARE - Schedule of Exchange Agreement (Details) - shares |  |  |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Jul. 31, 2019 | Jul. 31, 2018 | Oct. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 01, 2019 | Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2018
Class B Common Shares |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Class B common units and associated Class B common shares exchanged (in shares) |  |  | 1,310,771 |  |  |  |  |  |  |
Shares outstanding after exchange (in shares) |  |  | 62,767,860 |  |  |  |  |  |  |
Percentage of combined voting power (percent) |  | 49.80% |  |  |  |  |  |  |  |
Class A Common Shares |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares outstanding after exchange (in shares) |  |  | 63,274,182 |  |  |  |  |  |  |
Percentage of combined voting power (percent) |  | 50.20% |  |  |  |  |  |  |  |
Subsequent event | Class B Common Shares |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Class B common units and associated Class B common shares exchanged (in shares) | 6,873,699 |  |  |  |  |  |  |  |  |
Shares outstanding after exchange (in shares) | 55,581,646 |  |  |  |  |  |  |  |  |
Percentage of combined voting power (percent) | 46.00% |  |  |  |  |  |  |  |  |
Subsequent event | Class A Common Shares |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares outstanding after exchange (in shares) | 66,522,023 |  |  |  |  |  |  |  |  |
Percentage of combined voting power (percent) | 54.00% |  |  |  |  |  |  |  |  |
Treasury Stock |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Class B common units and associated Class B common shares exchanged (in shares) |  |  |  |  | (1,311,000) | (817,000) |  |  |  |
Shares held in treasury (shares) |  |  |  |  | (2,163,000) | (4,287,000) | (2,419,000) | (2,419,000) | (4,769,000) | (4,769,000)
Treasury Stock | Subsequent event | Class A Common Shares |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Class B common units and associated Class B common shares exchanged (in shares) |  |  |  | 5,000,000.0 |  |  |  |  |  |
Shares held in treasury (shares) | 200,000 |  |  | 200,000 |  |  |  |  |  |

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