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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) renewalOption | Sep. 30, 2023 USD ($)
Other Commitments [Line Items] |  |
Operating lease right-of-use assets | $ 59,730 | $ 50,400
Leases renewed | renewalOption | 1 |
Purchase commitments for equipment, parts and supplies | $ 153,200 |
Tulsa Industrial Facility |  |
Other Commitments [Line Items] |  |
Number of renewal options | renewalOption | 2 |
Renewal option term | 5 years |
Land and Building |  |
Other Commitments [Line Items] |  |
Operating lease, liability | $ 18,100 |
Operating lease right-of-use assets | $ 18,100 |

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