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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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