BORROWINGS - Additional Information (Details) $ in Millions, $ in Millions		1 Months Ended	12 Months Ended
	Mar. 27, 2026 USD ($) extension	Oct. 31, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2026 AUD ($)	Jun. 30, 2025 USD ($)
Debt Instrument [Line Items]
Long term debt			$ 1,989		$ 1,962
Revolving Credit Facility
Debt Instrument [Line Items]
Face amount of debt			1,000
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Increase to maximum borrowing capacity	$ 250
Line of Credit | Financing Lease Arrangement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 120
Debt instrument term		7 years
Interest rate margin		1.475%
2021 Senior notes | Senior Notes
Debt Instrument [Line Items]
Long term debt			995		993
2022 Senior notes | Senior Notes
Debt Instrument [Line Items]
Long term debt			$ 495		$ 494
Percentage of principal amount that may be redeemed upon change in control			101.00%	101.00%
2026 Facilities | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,500
2026 Facilities | Line of Credit | Base Rate
Debt Instrument [Line Items]
Interest rate margin	0.25%
2026 Facilities | Line of Credit | Relevant Rate
Debt Instrument [Line Items]
Interest rate margin	1.25%
2026 Facilities | Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100
2026 Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Operating income leverage ratio	3.5
2026 Revolving Credit Facility | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000
Debt instrument term	5 years
Number of extension options | extension	2
Extension term	1 year
Unused capacity commitment fee percentage	0.15%
Term Loan A Credit Facility | Line of Credit | Unsecured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 500
Debt instrument term	5 years
Amortization percentage, tranche one	0.00%
Amortization percentage, tranche two	2.50%
Amortization percentage, tranche three	2.50%
Amortization percentage, tranche four	5.00%
Amortization percentage, tranche five	5.00%
Extension term	1 year
Credit Facility 2022 | REA Group
Debt Instrument [Line Items]
Amount of unused borrowing capacity				$ 200
REA Credit Facility 2024 Tranche 1 | REA Group
Debt Instrument [Line Items]
Unused capacity commitment fee percentage			40.00%
REA Credit Facility 2024 Tranche 1 | Australian BBSY | REA Group | Minimum
Debt Instrument [Line Items]
Interest rate margin			1.45%
REA Credit Facility 2024 Tranche 1 | Australian BBSY | REA Group | Maximum
Debt Instrument [Line Items]
Interest rate margin			2.35%
REA Credit Facility 2024 | REA Group
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 500
Operating income leverage ratio			3.5
Interest coverage ratio			3.0