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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RELATED RISKS AND UNCERTAINTIES - Narrative (Details) shares in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2022 USD ($) shares | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2023 USD ($) geographical_area | Jun. 30, 2022 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  | $ 61,400,000 | $ 33,900,000 |  | $ 61,400,000 | $ 33,900,000 | $ 36,900,000 | $ 19,200,000
Additional cash and cash equivalents restricted at the election of management for potential insurance claims |  | 60,700,000 |  |  | 60,700,000 |  | 35,800,000 |
Receivables |  | 449,588,000 |  |  | 449,588,000 |  | 458,713,000 |
Contract liability |  | 34,726,000 |  |  | 34,726,000 |  | 20,646,000 |
Operating revenues |  | 723,956,000 | 550,233,000 |  | 2,212,815,000 | 1,427,612,000 |  |
Underwriting expense |  | 5,500,000 | 3,100,000 |  | 10,200,000 | 2,700,000 |  |
Casualty insurance premiums |  | 9,700,000 | 9,400,000 |  | 30,600,000 | 26,200,000 |  |
Premium revenues and expenses |  | 17,400,000 | 14,700,000 |  | 51,400,000 | 41,600,000 |  |
Stop-loss program, maximum amount of claim |  |  |  | $ 50,000 |  |  |  |
Stop-loss medical expenses |  | 2,100,000 | 3,800,000 |  | $ 7,400,000 | 10,600,000 |  |
Cumulative inflation rate before a country is considered highly inflationary |  |  |  |  | 100.00% |  |  |
Foreign currency losses |  | 1,400,000 | 1,200,000 |  | $ 1,700,000 | 4,500,000 |  |
Tamboran Resources Limited |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Payments to acquire investments | $ 14,100,000 |  |  |  |  |  |  |
Investment shares acquired (in shares) | shares | 106.0 |  |  |  |  |  |  |
Investee |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Receivables |  | 6,700,000 |  |  | 6,700,000 |  |  |
Contract liability |  | 5,700,000 |  |  | 5,700,000 |  |  |
Expected revenue |  | 35,200,000 |  |  |  |  |  |
International Solutions |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Operating revenues |  | $ 48,692,000 | $ 29,118,000 |  | $ 159,383,000 | $ 93,699,000 |  |
International Locations | Geographic Concentration Risk | Operating Revenue |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Concentration percentage |  | 6.80% | 5.40% |  | 7.30% | 6.70% |  |
Minimum |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of geographical areas operating | geographical_area |  |  |  |  | 1 |  |  |
Argentina |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Operating revenues |  | $ 32,388,000 | $ 18,615,000 |  | $ 101,712,000 | $ 63,216,000 |  |
Cash |  | $ 24,000,000 |  |  | $ 24,000,000 |  |  |
South America | International Locations | Geographic Concentration Risk | Operating Revenue | International Solutions |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Concentration percentage |  | 84.80% | 82.60% |  | 87.30% | 78.40% |  |
Acquisition of Drilling Technologies Companies |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  | $ 700,000 |  |  | $ 700,000 |  | $ 1,100,000 |

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