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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 54,772 $ 95,173
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 99,080 93,991
Amortization of debt discount and debt issuance costs 2,390 148
Stock-based compensation 6,851 7,672
Loss on investment securities 13,367 4,034
Gain on reimbursement of drilling equipment (9,403) (7,494)
Other (gain) loss on sale of assets 1,673 (2,443)
Deferred income tax benefit (9,923) (7,829)
Other (381) 305
Change in assets and liabilities    
Accounts receivable (6,404) (28,931)
Inventories of materials and supplies (9,500) (7,191)
Prepaid expenses and other 1,034 (8,404)
Other noncurrent assets (7,933) (1,150)
Accounts payable 4,492 23,865
Accrued liabilities 8,915 19,022
Other noncurrent liabilities 9,328 (5,970)
Net cash provided by operating activities 158,358 174,798
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (106,485) (136,411)
Purchase of short-term investments (95,956) (46,250)
Purchase of long-term investments (646) (291)
Proceeds from sale of short-term investments 242,920 57,956
Insurance proceeds from involuntary conversion 698 0
Proceeds from asset sales 12,120 11,929
Net cash provided by (used in) investing activities 52,651 (113,067)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividends paid (25,021) (42,294)
Debt issuance costs (1,216) 0
Payments for employee taxes on net settlement of equity awards (6,913) (8,820)
Payment of contingent consideration from acquisition of business 0 (250)
Share repurchases 0 (47,364)
Net cash used in financing activities (33,150) (98,728)
Net increase (decrease) in cash and cash equivalents and restricted cash 177,859 (36,997)
Cash and cash equivalents and restricted cash, beginning of period 1,528,660 316,238
Cash and cash equivalents and restricted cash, end of period 1,706,519 279,241
Cash paid/(received) during the period:    
Interest paid 0 927
Income tax paid 4,284 5,960
Income tax received 0 0
Payments for operating leases 3,822 3,262
Non-cash operating and investing activities:    
Change in accounts payable and accrued liabilities related to purchases of property, plant and equipment $ 12,422 $ (7,611)