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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ (159,948) $ 344,165 $ 434,100
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 625,085 397,344 382,314
Asset impairment charges 194,030 0 12,097
Amortization of debt discount and debt issuance costs 6,069 10,560 1,079
Stock-based compensation 31,594 31,198 32,456
(Gain) loss on investment securities 22,377 (13,953) (11,299)
Gain on reimbursement of drilling equipment (33,398) (33,309) (48,173)
Other loss on sale of assets 1,541 5,139 8,016
Deferred income tax benefit (78,661) (23,191) (20,400)
Other 14,039 5,132 8,979
Change in assets and liabilities:      
Accounts receivable (48,598) (10,744) 56,281
Inventories of materials and supplies (26,851) (20,764) (7,826)
Prepaid expenses and other 41,522 3,370 (1,803)
Other noncurrent assets (11,459) (20,740) (11,135)
Accounts payable (21,346) (2,291) 4,237
Accrued liabilities (74,607) 16,798 (10,139)
Other noncurrent liabilities 61,561 (4,051) 4,898
Net cash provided by operating activities 542,950 684,663 833,682
CASH FLOWS FROM INVESTING ACTIVITIES:      
Capital expenditures (426,373) (495,072) (395,460)
Purchase of short-term investments (117,057) (200,653) (180,993)
Purchase of long-term investments (3,296) (9,120) (20,748)
Payment for acquisition of business, net of cash acquired (1,836,072) 0 0
Proceeds from sale of short-term investments 378,353 204,152 195,311
Proceeds from sale of long-term investments 31,990 0 0
Insurance proceeds from involuntary conversion 2,366 5,533 9,221
Proceeds from asset sales 45,776 46,412 70,085
Other (1,029) (10,000) 0
Net cash used in investing activities (1,925,342) (458,748) (322,584)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Dividends paid (100,735) (168,459) (201,456)
Distributions to non-controlling interests (15,380) 0 0
Proceeds from debt issuance 400,000 1,247,629 0
Debt issuance costs (2,629) (22,934) 0
Payments for employee taxes on net settlement of equity awards (10,836) (12,177) (14,410)
Payment of contingent consideration from acquisition of business 0 (6,250) (250)
Payments on unsecured long-term debt (200,000) 0 0
Share repurchases 0 (51,302) (247,213)
Other (3,759) 0 (540)
Net cash provided by (used in) financing activities 66,661 986,507 (463,869)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 12,971 0 0
Net increase (decrease) in cash and cash equivalents and restricted cash (1,302,760) 1,212,422 47,229
Cash and cash equivalents and restricted cash, beginning of period 1,528,660 316,238 269,009
Cash and cash equivalents and restricted cash, end of period 225,900 1,528,660 316,238
Cash paid (received) during the period:      
Interest paid 82,295 15,947 17,099
Income tax paid 205,618 181,349 199,139
Income tax received (201) (1,224) (26,809)
Cash paid for amounts included in the measurement of lease liabilities:      
Payments for operating leases 56,590 13,260 12,441
Non-cash operating and investing activities:      
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment $ 11,780 $ (20,454) $ (2,554)