| Fiscal period | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
| Period End Date | 9/30/2025 | 9/30/2024 | 9/30/2023 | 9/30/2022 | 9/30/2021 | 9/30/2020 | 9/30/2019 | 9/30/2018 | 9/30/2017 | 9/30/2016 |
| Sales and other operating revenues | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Contract drilling | 3,678.66 | 2,746.13 | 2,862.68 | 2,049.84 | 1,210.80 | 1,761.71 | 2,785.56 | 2,449.05 | -- | -- |
| Drilling - U.S. Land | -- | -- | -- | -- | -- | -- | -- | -- | 1,439.52 | 1,242.46 |
| Drilling - U.S. Offshore | -- | -- | -- | -- | -- | -- | -- | -- | 136.26 | 138.60 |
| Drilling - International | -- | -- | -- | -- | -- | -- | -- | -- | 212.97 | 229.89 |
| Income from investments | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Revenue- Other | 67.35 | 10.48 | 9.74 | 9.10 | 7.77 | 12.21 | 12.93 | 38.22 | 15.98 | 13.28 |
| Real Estate | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Total Revenues | 3,746.01 | 2,756.61 | 2,872.42 | 2,058.94 | 1,218.57 | 1,773.93 | 2,798.49 | 2,487.27 | 1,804.74 | 1,624.23 |
| Operating costs, excluding depreciation | 56.02 | 4.48 | 4.48 | 4.64 | 5.14 | 5.78 | 5.38 | 26.22 | 1,249.32 | 898.81 |
| Contract drilling operating expenses, excluding depreciation and amortization | 2,511.41 | 1,630.23 | 1,715.10 | 1,426.59 | 952.60 | 1,184.79 | 1,803.20 | 1,626.39 | -- | -- |
| Depreciation | 625.09 | -- | -- | -- | -- | -- | -- | 583.80 | 585.54 | 598.59 |
| Depreciation and amortization | -- | 397.34 | 382.31 | 403.17 | 419.73 | 481.89 | 562.80 | -- | -- | -- |
| Research and development | 34.13 | 40.97 | 30.05 | 26.56 | 21.72 | 21.65 | 27.47 | 18.17 | 12.05 | 10.27 |
| Acquired in-process research and development | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| General and Administrative | 287.05 | 244.88 | 206.66 | 182.37 | 172.20 | 167.51 | 194.42 | 200.62 | 151.00 | 146.18 |
| Restructuring charges | 12.13 | 0.00 | 0.00 | 0.84 | 5.93 | 16.05 | -- | -- | -- | -- |
| Acquisition transaction costs | 54.70 | 14.98 | -- | -- | -- | -- | -- | -- | -- | -- |
| Income from asset sales | (1.54) | (5.14) | (8.02) | 5.43 | 1.04 | 46.78 | 39.69 | 22.66 | 20.63 | 9.90 |
| Gain from involuntary conversion of long-lived assets | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Dry holes and abandonments | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Taxes, other than income taxes | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Asset impairment | (194.03) | 0.00 | (12.10) | (4.36) | (70.85) | (563.23) | (224.33) | (23.13) | 0.00 | (6.25) |
| Gain on reimbursement of drilling equipment | 33.40 | 33.31 | 48.17 | 29.44 | -- | -- | -- | -- | -- | -- |
| Total Operating costs and other | 3,742.70 | 2,304.71 | 2,310.53 | 2,013.65 | 1,647.12 | 2,394.11 | 2,777.91 | 2,455.67 | 1,977.28 | 1,650.20 |
| Operating income from continuing operations | 3.32 | 451.90 | -- | 45.29 | (428.55) | (620.19) | 20.58 | 31.60 | (172.54) | (25.97) |
| Interest expense | 107.81 | 29.09 | 17.28 | 19.20 | 23.96 | 24.47 | 25.19 | 24.27 | 19.75 | 22.91 |
| GAIN ON SALE OF SUBSIDIARY | -- | -- | -- | -- | -- | 14.96 | -- | -- | -- | -- |
| Income from asset sales | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Gain/loss on sale of investment securities | (22.38) | 13.95 | 11.30 | 57.94 | 6.73 | (8.72) | (54.49) | 0.00 | -- | (25.99) |
| Interest and dividend income | 35.21 | 41.17 | 28.39 | 18.09 | 10.25 | 7.30 | 9.47 | 8.02 | 5.92 | 3.17 |
| Other | 27.23 | 3.09 | 9.08 | (11.12) | (5.66) | (5.38) | (1.60) | 0.49 | 1.78 | (0.97) |
| Foreign currency exchange loss | (9.68) | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Loss on extinguishment of debt | -- | 0.00 | -- | (60.08) | -- | -- | -- | -- | -- | -- |
| Total Other income (expense) | (77.43) | -- | -- | -- | (12.63) | (16.31) | (71.80) | (15.76) | (12.06) | (46.70) |
| Pre-Tax Income - Domestic | -- | -- | -- | -- | -- | -- | -- | 27.44 | (173.16) | (49.64) |
| Pre-Tax Income - Foreign | -- | -- | -- | -- | -- | -- | -- | (11.60) | (11.44) | (23.03) |
| Income before income taxes and equity in income of affiliate | (74.11) | 481.02 | 593.38 | 30.92 | (441.18) | (636.50) | (51.22) | 15.84 | (184.60) | (72.67) |
| Income tax (benefit) provision | 85.84 | 136.86 | 159.28 | 24.37 | (103.72) | (140.11) | (18.71) | (477.17) | (56.74) | (19.68) |
| Deferred: State | (3.92) | (2.30) | 1.19 | 5.20 | (12.10) | (18.07) | (11.55) | 14.08 | (1.33) | 1.54 |
| Current- Federal | 114.97 | 136.11 | 150.27 | 40.25 | (15.47) | 15.43 | 21.75 | 0.76 | (36.26) | (86.01) |
| Current- State | 13.94 | 16.18 | 16.52 | 1.91 | 0.73 | 0.52 | 3.37 | 2.34 | (0.47) | (3.74) |
| Current- Foreign | 35.59 | 7.76 | 12.88 | 10.70 | 0.77 | 1.50 | 0.73 | 6.49 | 4.11 | 9.99 |
| Deferred- Federal | (44.56) | (18.79) | (20.34) | (32.38) | (81.76) | (127.10) | (35.81) | (508.26) | (14.95) | 58.14 |
| Deferred- Foreign | (30.17) | (2.10) | (1.25) | (1.31) | 4.11 | (12.39) | 2.80 | 7.42 | (7.83) | 0.41 |
| Equity in income of affiliate net of income taxes | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Income from Continuing Operations | -- | -- | -- | 6.55 | (337.46) | (496.39) | (32.51) | 493.01 | (127.86) | (52.99) |
| Income from discontinued operations | -- | -- | -- | 0.40 | 11.31 | 30.58 | 32.85 | 23.39 | 3.29 | 2.36 |
| Discontinued operations: Income tax provision | -- | -- | -- | 0.00 | 0.00 | (28.69) | (33.99) | (33.73) | (3.63) | (6.20) |
| Net Income (loss) | (159.95) | 344.17 | 434.10 | 6.95 | -- | (494.50) | (33.66) | 482.67 | (128.21) | (56.83) |
| Net income attributable to non-controlling interest | 3.75 | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Earnings allocated to unvested shareholders | -- | 4.73 | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income (loss) attributable to common stockholders | (163.70) | 339.44 | 434.10 | 6.95 | (326.15) | (494.50) | (33.66) | 482.67 | (128.21) | (54.85) |
| Continuing Operations- (Basic) | -- | -- | -- | 0.05 | (3.14) | (4.62) | (0.33) | 4.49 | (1.20) | (0.50) |
| EPS (Basic) : Discontinued operations | -- | -- | -- | 0.00 | 0.10 | 0.02 | (0.01) | (0.10) | -- | (0.04) |
| Basic earnings per common share | (1.66) | 3.43 | 4.18 | 0.05 | (3.04) | (4.60) | (0.34) | 4.39 | (1.20) | (0.54) |
| Continuing Operations- (Diluted) | -- | -- | -- | 0.05 | (3.14) | (4.62) | (0.33) | 4.47 | (1.20) | (0.50) |
| EPS (Diluted) : Discontinued operations | -- | -- | -- | 0.00 | 0.10 | 0.02 | (0.01) | (0.10) | -- | (0.04) |
| Diluted earnings per common share | (1.66) | 3.43 | 4.16 | 0.05 | (3.04) | (4.60) | (0.34) | 4.37 | (1.20) | (0.54) |
| Weighted average shares outstanding- Basic | 99.27 | 98.86 | 102.45 | 105.89 | 107.82 | 108.01 | 109.22 | 108.85 | 108.50 | 108.00 |
| Weighted average shares outstanding- Diluted | 99.27 | 99.07 | 102.85 | 106.56 | 107.82 | 108.01 | 109.22 | 109.39 | 108.50 | 108.00 |