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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ (104,141) $ 268,689
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 436,228 296,352
Asset impairment charges 175,102 0
Amortization of debt discount and debt issuance costs 4,799 445
Stock-based compensation 22,837 23,777
Gain on investment securities (14,084) (102)
Gain on reimbursement of drilling equipment (26,149) (24,687)
Other loss on sale of assets 2,136 2,718
Deferred income tax benefit (64,649) (23,634)
Other 5,832 2,353
Change in assets and liabilities    
Accounts receivable 2,299 (6,936)
Inventories of materials and supplies (17,538) (20,595)
Prepaid expenses and other (56,792) (4,042)
Other noncurrent assets (14,610) (20,165)
Accounts payable (1,108) 21,959
Accrued liabilities (72,884) 7,744
Other noncurrent liabilities 58,722 (7,969)
Net cash provided by operating activities 336,000 515,907
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (362,232) (389,095)
Purchase of short-term investments (111,678) (148,451)
Purchase of long-term investments (2,055) (9,167)
Payment for acquisition of business, net of cash acquired (1,838,852) 0
Proceeds from sale of short-term investments 373,028 152,034
Proceeds from sale of long-term investments 31,990 0
Insurance proceeds from involuntary conversion 2,366 5,533
Proceeds from asset sales 34,923 35,148
Net cash used in investing activities (1,872,510) (353,998)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividends paid (75,534) (126,417)
Distributions to non-controlling interests (15,380) 0
Proceeds from debt issuance 400,000 0
Debt issuance costs (2,629) 0
Payments for employee taxes on net settlement of equity awards (10,759) (12,176)
Payment of contingent consideration from acquisition of business 0 (6,250)
Payments on unsecured long-term debt (73,000) 0
Share repurchases 0 (51,302)
Other (2,044) 0
Net cash provided by (used in) financing activities 220,654 (196,145)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 14,322 0
Net decrease in cash, cash equivalents and restricted cash (1,301,534) (34,236)
Cash, cash equivalents and restricted cash, beginning of period 1,528,660 316,238
Cash, cash equivalents and restricted cash, end of period 227,126 282,002
Cash paid/(received) during the period:    
Interest paid 67,724 8,150
Income tax paid 164,631 139,594
Cash paid for amounts included in the measurement of lease liabilities:    
Payments for operating leases 41,038 10,235
Non-cash operating and investing activities:    
Change in accounts payable and accrued liabilities related to purchases of property, plant and equipment $ 11,943 $ (9,052)