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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Revenues from External Customers and Long-Lived Assets by Country (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |
Operating revenues | $ 3,746,013 | $ 2,756,607 | $ 2,872,421
Property, plant and equipment, net | 4,313,074 | 3,016,277 |
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 2,481,593 | 2,558,814 | 2,656,617
Property, plant and equipment, net | 2,503,045 | 2,752,325 |
Saudi Arabia |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 261,747 | 0 | 0
Property, plant and equipment, net | 971,440 | 149,472 |
Norway |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 220,263 | 0 | 0
Property, plant and equipment, net | 25,431 | 0 |
Oman |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 179,568 | 0 | 0
Property, plant and equipment, net | 445,706 | 0 |
United Kingdom |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net | 71,385 | 0 |
Argentina |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 155,727 | 142,451 | 137,420
Property, plant and equipment, net | 71,135 | 62,533 |
Azerbaijan |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 129,011 | 0 | 0
Germany |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 57,561 | 0 | 0
Property, plant and equipment, net | 51,306 | 0 |
Colombia |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 36,058 | 9,254 | 46,720
Property, plant and equipment, net | 36,723 | 19,243 |
Kuwait |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 30,653 | 0 | 0
Property, plant and equipment, net | 40,760 | 0 |
Bahrain |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 30,816 | 17,990 | 15,401
Other foreign |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 163,016 | 28,098 | $ 16,263
Property, plant and equipment, net | $ 96,143 | $ 32,704 |

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