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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RELATED RISKS AND UNCERTAINTIES - Narrative (Details) $ in Thousands, shares in Millions | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2022 USD ($) shares | Dec. 31, 2024 USD ($) executive_officer geographical_area shares | Dec. 31, 2023 USD ($) | Feb. 05, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash and cash equivalents |  | $ 1,300,000 | $ 65,100 |  | $ 1,300,000 | $ 59,100
Additional cash and cash equivalents restricted at the election of management for potential insurance claims |  | 73,200 |  |  | 68,900 |
Convertible notes |  | $ 9,400 |  |  |  |
Convertible notes (in shares) | shares |  | 0.5 |  |  |  |
Number of executive officers serving on related party board | executive_officer |  | 1 |  |  |  |
Receivables |  | $ 426,933 |  |  | 418,604 |
Contract liability |  | 37,741 |  |  | 29,052 |
Drilling services |  | 674,613 | 674,565 |  |  |
Underwriting expense |  | 3,900 | 3,500 |  |  |
Casualty insurance premiums |  | 10,500 | 9,100 |  |  |
Premium revenues and expenses |  | 16,600 | 15,200 |  |  |
Stop-loss medical expenses |  | $ 5,200 | 4,100 |  |  |
Cumulative inflation rate before a country is considered highly inflationary |  | 100.00% |  |  |  |
Foreign currency losses |  | $ 900 | $ 1,800 |  |  |
Subsequent Event |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Additional cash and cash equivalents restricted at the election of management for potential insurance claims |  |  |  | $ 1,200,000 |  |
KCA Deutag Acquisition |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash and cash equivalents |  | $ 1,200,000 |  |  | 1,200,000 |
International Locations | Geographic Concentration Risk | Operating Revenue |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration percentage |  | 7.20% | 8.20% |  |  |
Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of geographical areas operating | geographical_area |  | 1 |  |  |  |
South America | International Locations | Geographic Concentration Risk | Operating Revenue | International Solutions |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration percentage |  | 71.30% | 78.50% |  |  |
Tamboran Resources Limited |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Payments to acquire investments | $ 14,100 |  |  |  |  |
Investment shares acquired (in shares) | shares | 106.0 |  |  |  |  |
Investee |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Receivables |  | $ 1,000 |  |  | 5,000 |
Contract liability |  | 3,400 |  |  | $ 3,900 |
Drilling services |  | 4,800 | $ 4,300 |  |  |
Expected revenue |  | $ 35,000 |  |  |  |

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