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NOTES PAYABLE AND COMMERCIAL BANK FINANCING - STG Senior Unsecured Notes and RSN Debt Financing (Details) - USD ($)			2 Months Ended
	Aug. 13, 2019	Aug. 02, 2019	Sep. 30, 2019	Aug. 09, 2019	Jun. 30, 2019
Senior Notes \| 5.375% Senior Unsecured Notes due 2021
Debt Instrument [Line Items]
Interest rate (as a percent)					5.375%
Senior Notes \| Subsequent Event \| Diamond Notes \| Prior to February 3, 2020
Debt Instrument [Line Items]
Redemption price, percent		100.00%
Senior Notes \| Subsequent Event \| Diamond Notes \| Prior to August 15, 2022
Debt Instrument [Line Items]
Redemption price, percent		100.00%
Redemption price, percentage of principal amount redeemed		40.00%
Senior Notes \| Subsequent Event \| Diamond 5.375% Secured Notes
Debt Instrument [Line Items]
Interest rate (as a percent)		5.375%
Senior Notes \| Subsequent Event \| Diamond 5.375% Secured Notes \| August 15, 2022 to August 14, 2023
Debt Instrument [Line Items]
Redemption price, percent		102.688%
Senior Notes \| Subsequent Event \| Diamond 5.375% Secured Notes \| August 15, 2023 to August 14, 2024
Debt Instrument [Line Items]
Redemption price, percent		101.344%
Senior Notes \| Subsequent Event \| Diamond 5.375% Secured Notes \| August 15, 2024 and Thereafter
Debt Instrument [Line Items]
Redemption price, percent		100.00%
Senior Notes \| Subsequent Event \| Diamond 6.625% Notes
Debt Instrument [Line Items]
Interest rate (as a percent)		6.625%
Senior Notes \| Subsequent Event \| Diamond 6.625% Notes \| August 15, 2022 to August 14, 2023
Debt Instrument [Line Items]
Redemption price, percent		103.313%
Senior Notes \| Subsequent Event \| Diamond 6.625% Notes \| August 15, 2023 to August 14, 2024
Debt Instrument [Line Items]
Redemption price, percent		101.656%
Senior Notes \| Subsequent Event \| Diamond 6.625% Notes \| August 15, 2024 and Thereafter
Debt Instrument [Line Items]
Redemption price, percent		100.00%
Forecast \| 5.375% Senior Unsecured Notes due 2021
Debt Instrument [Line Items]
Repayments of debt	$ 600,000,000.0
Interest rate (as a percent)	5.375%
Forecast \| RSNs
Debt Instrument [Line Items]
Full committed privately-placed preferred equity			$ 1,000,000,000.0
Forecast \| STG Term Loan Facility \| RSNs
Debt Instrument [Line Items]
Debt term			7 years
Maximum borrowing capacity				$ 700,000,000
Forecast \| STG Term Loan Facility \| RSNs \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			2.50%
Forecast \| Diamond Term Loan Facility \| RSNs
Debt Instrument [Line Items]
Debt term			7 years
Maximum borrowing capacity				3,300,000,000
Forecast \| Diamond Term Loan Facility \| RSNs \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			3.25%
Forecast \| STG Revolving Credit Facility \| RSNs
Debt Instrument [Line Items]
Debt term			5 years
Maximum borrowing capacity				650,000,000
Forecast \| STG Revolving Credit Facility \| RSNs \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			2.00%
Forecast \| Diamond Revolving Credit Facility \| RSNs
Debt Instrument [Line Items]
Debt term			5 years
Maximum borrowing capacity				$ 650,000,000
Forecast \| Diamond Revolving Credit Facility \| RSNs \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			3.00%
Forecast \| Senior Notes \| 5.375% Senior Unsecured Notes due 2021
Debt Instrument [Line Items]
Repayments of debt	$ 600,000,000.0
Interest rate (as a percent)	5.375%
Redemption price, percent	100.00%
Forecast \| Term Loan \| Term Loan B
Debt Instrument [Line Items]
Debt term	7 years
Proceeds from issuance of debt	$ 600,000,000.0