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BUSINESS COMBINATION - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 16, 2025 USD ($) agreement | May 31, 2025 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jan. 17, 2025 USD ($) | Sep. 17, 2024 USD ($)
Business Combination [Line Items] |  |  |  |  |  |  |  |
Foreign currency exchange loss |  |  |  | $ (9,682) | $ (5,550) | $ (6,419) |  |
Weighted average discount rate |  |  | 5.20% | 5.20% | 5.10% |  |  |
Weighted average remaining lease term |  |  | 9 years 10 months 24 days | 9 years 10 months 24 days | 11 years 7 months 6 days |  |  |
Loan agreements acquired | agreement | 2 |  |  |  |  |  |  |
Business combination, service benefit plans |  |  | $ 44,800 | $ 44,800 |  |  |  |
Acquisition transaction costs |  |  |  | 54,702 | $ 14,982 | $ 0 |  |
Measurement period adjustments |  |  |  | $ 15,775 |  |  |  |
Customer relationships |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Weighted average useful life |  |  | 9 years | 9 years | 15 years |  |  |
Notes | Senior Notes |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  | $ 1,250,000 | $ 1,250,000
KCA Deutag |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Consideration given | $ 2,035,523 |  | $ 2,000,000 |  |  |  |  |
Unadjusted share purchase price | 900,000 |  |  |  |  |  |  |
Consideration repay | 1,100,000 |  |  |  |  |  |  |
Escrow deposit | $ 80,000 |  |  |  |  |  |  |
Foreign currency exchange loss |  | $ 5,200 |  |  |  |  |  |
Percentage of weighted average cost inventory | 11.00% |  |  |  |  |  |  |
Weighted average discount rate | 5.60% |  |  |  |  |  |  |
Unfavorable lease adjustment | $ 9,800 |  |  |  |  |  |  |
Weighted average remaining lease term |  |  | 10 years 1 month 6 days | 10 years 1 month 6 days |  |  |  |
Deferred tax liabilities and inventory |  |  | $ 4,000 |  |  |  |  |
Revenue and net loss attributable to the net assets acquired | 1,000,000 |  |  | $ (337,200) |  |  |  |
KCA Deutag | Customer relationships |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Weighted average useful life |  |  | 2 years | 2 years |  |  |  |
KCA Deutag | 2024 KCA Deutag Oman Facility |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Consideration repay | $ 84,900 |  |  |  |  |  |  |

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