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DEBT - Narrative (Details) ر.ع. in Millions				1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 09, 2025 USD ($)	Sep. 17, 2024 USD ($)	Aug. 14, 2024 USD ($) extension	Oct. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 OMR (ر.ع.)	Jul. 31, 2025 USD ($)	Jan. 17, 2025 USD ($)	Apr. 25, 2024 USD ($)	Jun. 19, 2023 USD ($)	Sep. 29, 2021 USD ($)
Debt Instrument [Line Items]
Face Amount					$ 2,082,880,000	$ 2,082,880,000	$ 1,800,000,000
Long-term debt					2,063,943,000	2,063,943,000	1,782,182,000
Commitment fees							10,600,000
Current portion of long-term debt, net					6,859,000	6,859,000	0
Revolving commitments under amended credit facility expire			$ 775,000,000
Credit facility maturity term			1 year
Bridge Loan
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 2,000,000,000	$ 2,000,000,000	335,300,000
Long-term debt, term					364 days	364 days		364 days
Commitment fees							1,400,000
Interest expense, debt							9,200,000
Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 400,000,000
Debt term after funding						2 years
Extinguishment of debt amount						$ 200,000,000
Long-term debt					$ 200,000,000	200,000,000			$ 190,000,000
Secured Debt | Subsequent Event
Debt Instrument [Line Items]
Extinguishment of debt amount				$ 10,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			950,000,000
Revolving commitments under amended credit facility mature			$ 175,000,000
Line of credit, number of loan extensions | extension			2
Line of credit facility accordion increase			$ 100,000,000
Notes | Senior Notes
Debt Instrument [Line Items]
Face amount of debt		$ 1,250,000,000								$ 1,250,000,000
Unsecured Senior Notes Due 2027 | Senior Notes
Debt Instrument [Line Items]
Face amount of debt		$ 350,000,000
Interest rate (as a percent)		465.00%
Debt instrument, redemption price, percentage		99.958%
Unsecured Senior Notes Due 2029 | Senior Notes
Debt Instrument [Line Items]
Face amount of debt		$ 350,000,000
Interest rate (as a percent)		4.85%
Debt instrument, redemption price, percentage		99.883%
Due December 1, 2029
Debt Instrument [Line Items]
Face Amount					350,000,000	350,000,000	350,000,000
Long-term debt					346,602,000	346,602,000	346,297,000
Due December 1, 2034
Debt Instrument [Line Items]
Face Amount					550,000,000	550,000,000	550,000,000
Long-term debt					$ 543,197,000	$ 543,197,000	$ 543,054,000
Unsecured Senior Notes Due 2034 | Senior Notes
Debt Instrument [Line Items]
Face amount of debt		$ 550,000,000
Interest rate (as a percent)		550.00%
Debt instrument, redemption price, percentage		99.67%
Unsecured Senior Notes due September 29, 2031
Debt Instrument [Line Items]
Face amount of debt													$ 550,000,000.0
Interest rate (as a percent)													2.90%
Term Loan Credit Facility
Debt Instrument [Line Items]
Line of credit facility, interest rate during period					5.61%
Line of credit facility, commitment fees, if debt was issued						0.175
Weighted average interest rate over time					575.00%
Term Loan Credit Facility | Minimum
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage			0.10%
Term Loan Credit Facility | Maximum
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage			0.25%
Term Loan Credit Facility | Adjusted Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate spread			0.10%
Term Loan Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Interest rate spread			0.50%
Term Loan Credit Facility | One Month Adjusted Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate spread			1.00%
Term Loan Credit Facility | Secured Overnight Financing Rate (SOFR) SOFR Applicable Margin Rate | Minimum
Debt Instrument [Line Items]
Interest rate spread			1.00%
Term Loan Credit Facility | Secured Overnight Financing Rate (SOFR) SOFR Applicable Margin Rate | Maximum
Debt Instrument [Line Items]
Interest rate spread			1.625%
Term Loan Credit Facility | Adjusted Base Rate, Applicable Margin Rate | Minimum
Debt Instrument [Line Items]
Interest rate spread			0.00%
Term Loan Credit Facility | Adjusted Base Rate, Applicable Margin Rate | Maximum
Debt Instrument [Line Items]
Interest rate spread			0.625%
Term Loan Credit Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate, if debt was issued					0.01375	0.01375		0.01375
2024 Oman Facility
Debt Instrument [Line Items]
Interest rate (as a percent)					500.00%	500.00%		500.00%
Face Amount					$ 43,100,000	$ 43,100,000		ر.ع. 17.6			$ 45,500,000
Interest rate spread						175.00%
Debt instrument, interest rate, fixed percentage						600.00%
Debt instrument, interest rate period one							2 years
Proceeds from lines of credit	$ 1,400,000
Repayments of lines of credit						$ 2,600,000
Current portion of long-term debt, net					$ 3,400,000	$ 3,400,000
Debt service coverage ratio						1.20
Credit facility maturity term						1 year
2023 Oman Facility
Debt Instrument [Line Items]
Interest rate (as a percent)					500.00%	500.00%		500.00%
Face Amount					$ 39,800,000	$ 39,800,000						$ 45,600,000
Interest rate spread						175.00%
Debt instrument, interest rate, fixed percentage						600.00%
Debt instrument, interest rate period one							2 years
Repayments of lines of credit						$ 2,600,000
Credit facility maturity term						1 year
2023 Oman Facility | Short-Term Debt
Debt Instrument [Line Items]
Repayments of debt						$ 3,400,000
2018 Credit Facility
Debt Instrument [Line Items]
Commitment fee rate						0.15%
Maximum limit of priority debt on net worth			17.50%
Borrowings outstanding					0	$ 0
Available borrowing capacity					$ 950,000,000.0	$ 950,000,000.0
2018 Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee rate			0.075%
2018 Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee rate			0.20%
Total debt to total capitalization ratio			55.00%
2018 Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Interest rate spread			0.50%
2018 Credit Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate spread			0.10%
Spread over SOFR					1.25%	1.25%		1.25%
2018 Credit Facility | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate spread			0.875%
2018 Credit Facility | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Interest rate spread			1.50%
2018 Credit Facility | One Month Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Debt Instrument [Line Items]
Interest rate spread			1.00%
2018 Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Interest rate spread			0.00%
2018 Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Interest rate spread			50.00%
Unsecured Standalone Line of Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 400,000,000.0	$ 400,000,000.0
Letter of Credit - Instrument 3 | Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding					$ 221,900,000	$ 221,900,000

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