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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RELATED RISKS AND UNCERTAINTIES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash | $ 34.9 |  | $ 34.9 |  | $ 29.1 |
Additional cash and cash equivalents restricted at the election of management for potential insurance claims | 33.6 |  | 33.6 |  | $ 27.4 |
Premium revenues and expenses | 17.3 | $ 16.3 | 55.2 | $ 50.8 |  |
Underwriting expense | (3.7) | 29.3 | (1.6) | 43.5 |  |
Casualty insurance premiums | 12.6 | 10.1 | 35.9 | 31.8 |  |
Stop-loss medical expenses | $ 4.8 | $ 4.4 | $ 11.5 | $ 14.8 |  |
International Locations | Geographic Concentration Risk | Operating Revenue |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration percentage | 42.70% | 36.70% | 41.70% | 31.40% |  |
International Locations | Geographic Concentration Risk | Operating Revenue | Middle East |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration percentage | 15.70% | 16.10% | 16.20% | 13.20% |  |
International Locations | Geographic Concentration Risk | Operating Revenue | Saudi Arabia |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration percentage | 7.20% | 10.00% | 6.90% | 7.40% |  |
KCA Deutag Acquisition |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash |  |  |  |  |  | $ 1,200.0

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