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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RELATED RISKS AND UNCERTAINTIES - Narrative (Details) $ / shares in Units, $ in Thousands, shares in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 16, 2025 | Oct. 31, 2022 USD ($) shares | Sep. 30, 2025 USD ($) geographical_area $ / shares shares | Sep. 30, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) $ / shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash |  |  | $ 29,100 | $ 1,300,000 |
Additional cash and cash equivalents restricted at the election of management for potential insurance claims |  |  | 27,400 | 68,900 |
Inventory valuation reserves |  |  | 93,500 | 19,500 |
Depository beneficial interests |  | 0.50% |  |  |
Convertible notes |  |  | $ 9,400 |  |
Convertible notes (in shares) | shares |  |  | 0.5 |  |
Receivables |  |  | $ 782,644 | 418,604 |
Contract liability |  |  | 81,213 | 29,052 | $ 28,882
Drilling services |  |  | 3,678,660 | 2,746,128 | 2,862,677
Early termination revenue |  |  | 2,300 | 13,400 | 2,300
Net income |  |  | $ (163,695) | $ 344,165 | $ 434,100
Basic (in dollars per share) | $ / shares |  |  | $ (1.66) | $ 3.43 | $ 4.18
Diluted (in dollars per share) | $ / shares |  |  | $ (1.66) | $ 3.43 | $ 4.16
Underwriting expenses |  |  | $ 39,900 | $ 11,400 | $ 12,500
Casualty insurance premiums |  |  | 42,700 | 37,600 | 39,700
Premium revenues and expenses |  |  | 69,200 | 61,200 | 67,400
Stop-loss medical expenses |  |  | 20,700 | 15,500 | 10,600
Operating revenues |  |  | $ 3,746,013 | 2,756,607 | 2,872,421
Number of geographical areas operating | geographical_area |  |  | 1 |  |
Investee |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Receivables |  |  | $ 700 | 5,000 |
Contract liability |  |  | 3,900 | 3,900 |
Drilling services |  |  | 16,100 | $ 14,100 |
Expected revenue |  |  | 26,300 |  |
Investment in Tamboran |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Payments to acquire investments |  | $ 14,100 |  |  |
Investment shares acquired (in shares) | shares |  | 106.0 |  |  |
Intangible Assets, Amortization Period |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Amortization |  |  | 15,600 |  |
Net income |  |  | $ (12,400) |  |
Basic (in dollars per share) | $ / shares |  |  | $ (0.12) |  |
Diluted (in dollars per share) | $ / shares |  |  | $ (0.12) |  |
Customer relationships |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Weighted average useful life |  |  | 9 years | 15 years |
Saudi Arabia |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Operating revenues |  |  | $ 261,747 | $ 0 | 0
Operating Revenues | Geographic Concentration Risk | International Locations |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration percentage |  |  | 33.80% | 7.20% |
Concentration percentage |  |  |  | 27.00% |
Operating Revenues | Geographic Concentration Risk | International Locations | Middle East |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration percentage |  |  | 13.90% |  |
Largest Drilling Customer | Customer Concentration Risk |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Operating revenues |  |  | $ 451,300 | $ 302,600 |
Largest Drilling Customer | Operating Revenues | Customer Concentration Risk |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration percentage |  |  | 12.00% | 11.00% |
Reimbursements Received for Out-of-Pocket Expenses |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Drilling services |  |  | $ 431,200 | $ 334,600 | $ 345,500
Minimum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Weighted average useful life |  |  | 1 year |  |
Lease term, lessee |  |  | 1 year |  |
Deductible per occurrence |  |  | $ 1,000 |  |
Maximum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Weighted average useful life |  |  | 16 years |  |
Lease term, lessee |  |  | 15 years |  |
Deductible per occurrence |  |  | $ 10,000 |  |
KCA Deutag Acquisition |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash |  |  |  | $ 1,200,000 |
KCA Deutag Acquisition | Operating Revenues | Geographic Concentration Risk | International Locations | Middle East |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration percentage |  |  |  | 1.00% |
KCA Deutag Acquisition | Operating Revenues | Geographic Concentration Risk | International Locations | Saudi Arabia |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration percentage |  |  | 7.00% |  |
KCA Deutag |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Inventory valuation reserves |  |  | $ 74,700 |  |
Operating period | 258 days |  | 365 days |  |
KCA Deutag | Customer relationships |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Weighted average useful life |  |  | 2 years |  |

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