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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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Number of Common Units Outstanding After Exchange

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The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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