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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 | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2022 USD ($) shares | Mar. 31, 2024 USD ($) geographical_area executiveOfficer | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) executiveOfficer | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash and cash equivalents |  | $ 68,500 | $ 53,200 | $ 68,500 | $ 53,200 | $ 59,100 | $ 36,900
Additional cash and cash equivalents restricted at the election of management for potential insurance claims |  |  |  |  |  | 58,400 |
Number of executive officers serving on related party board | executiveOfficer |  | 1 |  | 1 |  |  |
Receivables |  | $ 431,681 |  | $ 431,681 |  | 404,188 |
Other assets, net |  | 45,054 |  | 45,054 |  | 32,061 |
Contract liability |  | 26,804 |  | 26,804 |  | 28,882 |
Drilling services |  | 685,131 | 766,682 | 1,359,696 | 1,483,852 |  |
Underwriting expense |  | 1,600 | 1,700 | 5,100 | 4,700 |  |
Casualty insurance premiums |  | 9,900 | 10,900 | 19,000 | 20,900 |  |
Premium revenues and expenses |  | 15,800 | 17,700 | 31,000 | 34,100 |  |
Stop-loss medical expenses |  | 3,200 | 2,500 | $ 7,300 | 5,300 |  |
Cumulative inflation rate before a country is considered highly inflationary |  |  |  | 100.00% |  |  |
Foreign currency losses |  | $ 600 | $ 100 | $ 2,400 | $ 300 |  |
International Locations | Geographic Concentration Risk | Operating Revenue |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration percentage |  | 6.90% | 7.40% | 7.50% | 7.50% |  |
Minimum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of geographical areas operating | geographical_area |  | 1 |  |  |  |  |
Argentina |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash |  | $ 13,000 |  | $ 13,000 |  |  |
South America | International Locations | Geographic Concentration Risk | Operating Revenue | International Solutions |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration percentage |  | 74.60% | 86.30% | 76.70% | 88.40% |  |
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 |  | $ 2,700 |  | $ 2,700 |  | 2,800 |
Other assets, net |  | 8,100 |  | 8,100 |  | 8,000 |
Contract liability |  | 5,100 |  | 5,100 |  | 6,600 |
Drilling services |  | 2,700 |  | $ 7,000 |  |  |
Expected revenue |  | $ 33,700 |  |  |  |  |
Acquisition of Drilling Technologies Companies |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  |  |  |  | $ 700 |

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