BASIS OF PRESENTATION (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020	Jul. 01, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Credit losses on available-for-sale debt securities recognized during the period	$ 0	$ 0	$ 0	$ 0
Net decrease of retained earnings	(2,950,306,000)	(2,687,970,000)	(2,950,306,000)	(2,687,970,000)	$ (2,762,345,000)		$ (2,681,010,000)	$ (2,679,619,000)	$ (2,677,693,000)
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Net decrease of retained earnings							5,530,000
Retained Earnings
Financing Receivable, Allowance for Credit Loss [Line Items]
Net decrease of retained earnings	$ (903,696,000)	$ (719,001,000)	$ (903,696,000)	$ (719,001,000)	$ (753,915,000)		(654,930,000)	$ (733,173,000)	$ (714,825,000)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Net decrease of retained earnings						$ 5,500,000	$ 5,530,000