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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) geographical_area | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash | $ 33,900,000 |  | $ 51,300,000 | $ 33,900,000 | $ 51,300,000 | $ 19,200,000 | $ 48,900,000
Additional cash restricted at the election of management for potential insurance claims | 32,800,000 |  |  | 32,800,000 |  | 17,700,000 |
Increase (decrease) in cash and cash equivalents and restricted cash Label Role |  |  |  | (714,127,000) | (114,875,000) |  |
Payment for extinguishment of long-term debt |  |  |  | 487,148,000 | 0 |  |
Adjustments to casualty insurance accruals | 3,100,000 |  | 6,000,000 | 2,700,000 | 8,800,000 |  |
Casualty insurance expense | 9,400,000 |  | 5,600,000 | 26,200,000 | 13,100,000 |  |
Premium revenues and expenses |  |  |  | 41,600,000 | 25,200,000 |  |
Stop-loss program, maximum amount of claim |  |  |  | 50,000 |  |  |
Stop-loss medical expenses | 3,800,000 |  | 3,200,000 | $ 10,600,000 | 8,700,000 |  |
Cumulative inflation rate before a country is considered highly inflationary (as a percent) |  |  |  | 100.00% |  |  |
Foreign currency loss | $ 1,200,000 |  | $ 700,000 | $ 4,500,000 | $ 4,900,000 |  |
Operating Revenue | Geographic Concentration Risk | International Locations |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration percentage (as a percent) | 5.40% |  | 4.80% | 6.70% | 4.80% |  |
Minimum |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of geographical areas operating in (more than) | geographical_area |  |  |  | 1 |  |  |
Argentina |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash | $ 3,800,000 |  |  | $ 3,800,000 |  |  |
South America | Operating Revenue | Geographic Concentration Risk | International Locations | International Solutions |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration percentage (as a percent) | 82.60% |  | 52.20% | 78.40% | 43.10% |  |
Intercompany Eliminations |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Premium revenues and expenses | $ 14,700,000 |  | $ 9,400,000 |  |  |  |
Unsecured Senior Notes Issued 2025 |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Payment for extinguishment of long-term debt |  |  |  | $ 487,100,000 |  |  |
Make-whole premium and accrued interest |  | $ 56,400,000 |  |  |  |  |
Acquisition of Drilling Technology Companies |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash | $ 1,100,000 |  |  | $ 1,100,000 |  | $ 1,500,000 |

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