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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2022 | Sep. 30, 2021
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | $ 42,500,000 | $ 18,500,000 |  | $ 36,900,000 | $ 19,200,000
Additional cash and cash equivalents restricted at the election of management for potential insurance claims | 41,800,000 |  |  | 35,800,000 |
Underwriting expenses | 2,900,000 | 2,200,000 |  |  |
Casualty insurance premiums | 10,000,000 | 8,800,000 |  |  |
Premium revenues and expenses | 16,400,000 | 13,600,000 |  |  |
Stop-loss program, maximum amount of claim |  |  | $ 50,000 |  |
Stop-loss medical expenses | $ 2,800,000 | 3,200,000 |  |  |
Cumulative inflation rate before a country is considered highly inflationary | 100.00% |  |  |  |
Foreign currency losses | $ 200,000 | $ 1,000,000 |  |  |
International Locations | Geographic Concentration Risk | Operating Revenues |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration percentage | 7.70% | 9.30% |  |  |
Argentina |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash | $ 19,700,000 |  |  |  |
South America | International Locations | Geographic Concentration Risk | Segment Revenue | International Solutions Segment |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration percentage | 90.50% | 77.10% |  |  |
Acquisition of Drilling Technologies Companies |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | $ 700,000 |  |  | $ 1,100,000 |

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