LONG-TERM DEBT - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended
	May 30, 2018	Oct. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Oct. 31, 2019	Jan. 16, 2014
Debt Instrument [Line Items]
Long-term debt			$ 4,225,000,000		$ 4,227,500,000
Repayment of long-term debt			$ 2,500,000	$ 2,500,000
Revolver | Line of Credit
Debt Instrument [Line Items]
Effective interest rate percentage			1.90%
Leverage ratio, compliance maximum			4
Leverage ratio			1.8
Interest expense			$ 3,000,000.0	0
Credit agreement, maximum capacity			750,000,000			$ 450,000,000
Long-term debt			600,000,000	0	600,000,000
Remaining borrowing capacity			$ 150,000,000
Revolver | Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Repayment of long-term debt		$ 600,000,000
Revolver | Line of Credit | LIBOR | Minimum
Debt Instrument [Line Items]
Interest addition to floating rate			1.25%
Revolver | Line of Credit | LIBOR | Maximum
Debt Instrument [Line Items]
Interest addition to floating rate			1.75%
Term Loan B
Debt Instrument [Line Items]
Debt instrument face amount	$ 1,000,000,000						$ 800,000,000
Proceeds from issuance of debt	$ 1,000,000,000
Term loan period			7 years
Term loan quarterly repayment as percentage of principal			0.25%
Effective interest rate percentage			1.91%
Leverage ratio, compliance maximum			4
Leverage ratio			1.8
Interest expense			$ 4,800,000	$ 10,100,000
Long-term debt			$ 975,000,000		$ 977,500,000
Term Loan B | LIBOR
Debt Instrument [Line Items]
Interest addition to floating rate			1.75%