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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Foreign currency losses |  | $ 5,900,000 | $ 5,300,000 | $ 8,800,000
Restricted cash and cash equivalents |  | 36,900,000 | 19,200,000 |
Additional cash and cash equivalents restricted at the election of management for potential insurance claims |  | 35,800,000 | 17,700,000 |
Reserves for excess and obsolete inventory |  | 28,000,000 | 29,300,000 |
Drilling services |  | 2,049,841,000 | 1,210,800,000 | 1,761,714,000
Early termination revenue |  | 700,000 | 7,700,000 | 73,400,000
Retained earnings |  | (2,473,572,000) | (2,573,375,000) |
Income tax expense (benefit) |  | (24,366,000) | 103,721,000 | 140,106,000
Underwriting expenses |  | 7,000,000 | 12,600,000 | 16,400,000
Casualty insurance premiums |  | 35,600,000 | 21,900,000 | 6,700,000
Premium revenues and expenses |  | 57,000,000 | 35,400,000 | 36,900,000
Stop-loss program, maximum amount of claim |  | 50,000 |  |
Stop-loss medical expenses |  | $ 11,800,000 | $ 12,000,000 | 8,000,000
Cumulative inflation rate before a country is considered highly inflationary |  | 100.00% |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accounts receivable, allowance for credit loss | $ 1,600,000 |  |  |
Retained earnings | 1,600,000 |  |  |
Income tax expense (benefit) | $ 1,300,000 |  |  |
International Locations | Geographic Concentration Risk | Operating Revenues |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration percentage |  | 6.70% | 5.00% |
South America | International Locations | Geographic Concentration Risk | International Solutions | Segment Revenue |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration percentage |  | 81.60% | 48.90% |
Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated life of finite-lived intangible assets used for amortization |  | 5 years |  |
Lease term, lessor |  | 3 years |  |
Lease term, lessee |  | 1 year |  |
Deductible per occurrence |  | $ 1,000,000 |  |
Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated life of finite-lived intangible assets used for amortization |  | 20 years |  |
Lease term, lessor |  | 10 years |  |
Lease term, lessee |  | 15 years |  |
Deductible per occurrence |  | $ 10,000,000 |  |
Reimbursements Received for Out-of-Pocket Expenses |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Drilling services |  | 263,100,000 | $ 148,000,000 | $ 212,000,000
Acquisition of Drilling Technologies Companies |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash and cash equivalents |  | $ 1,100,000 | $ 1,500,000 |

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