FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Supplemental Fair Value Information about Long-Term Fixed-Rate Debt (Details) - USD ($) $ in Thousands |
Dec. 31, 2024 |
Sep. 30, 2024 |
|---|---|---|
| Long-term debt, net | ||
| Carrying value | $ 1,781,674 | $ 1,782,182 |
| Carrying value | ||
| Long-term debt, net | ||
| Carrying value | 1,781,700 | 1,782,200 |
| Fair value | Level 2 | ||
| Long-term debt, net | ||
| Fair value | $ 1,666,500 | $ 1,702,900 |