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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 344,165,000 $ 434,100,000 $ 6,953,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 397,344,000 382,314,000 403,170,000
Asset impairment charges 0 12,097,000 4,363,000
Amortization of debt discount and debt issuance costs 10,560,000 1,079,000 1,200,000
Loss on extinguishment of debt 0 0 60,083,000
Stock-based compensation 31,198,000 32,456,000 28,032,000
Gain on investment securities (13,953,000) (11,299,000) (57,937,000)
Gain on reimbursement of drilling equipment (33,309,000) (48,173,000) (29,443,000)
Other (gain) loss on sale of assets 5,139,000 8,016,000 (5,432,000)
Deferred income tax benefit (23,191,000) (20,400,000) (28,488,000)
Other 5,132,000 8,979,000 7,140,000
Change in assets and liabilities:      
Accounts receivable (10,744,000) 56,281,000 (235,562,000)
Inventories of materials and supplies (20,764,000) (7,826,000) (5,228,000)
Prepaid expenses and other 3,370,000 (1,803,000) 6,224,000
Other noncurrent assets (20,740,000) (11,135,000) 2,581,000
Accounts payable (2,291,000) 4,237,000 53,242,000
Accrued liabilities 16,798,000 (10,139,000) 45,069,000
Other noncurrent liabilities (4,051,000) 4,898,000 (22,054,000)
Net cash provided by operating activities 684,663,000 833,682,000 233,913,000
CASH FLOWS FROM INVESTING ACTIVITIES:      
Capital expenditures (495,072,000) (395,460,000) (250,894,000)
Other capital expenditures related to assets held-for-sale 0 0 (21,645,000)
Purchase of short-term investments (200,653,000) (180,993,000) (165,109,000)
Purchase of long-term investments (9,120,000) (20,748,000) (51,241,000)
Proceeds from sale of short-term investments 204,152,000 195,311,000 244,728,000
Proceeds from sale of long-term investments 0 0 22,042,000
Proceeds from asset sales 46,412,000 70,085,000 62,304,000
Insurance proceeds from involuntary conversion 5,533,000 9,221,000 0
Other (10,000,000) 0 (7,500,000)
Net cash used in investing activities (458,748,000) (322,584,000) (167,315,000)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Dividends paid (168,459,000) (201,456,000) (107,395,000)
Proceeds from debt issuance 1,247,629,000 0 0
Debt issuance costs (22,934,000) 0 0
Payments for employee taxes on net settlement of equity awards (12,177,000) (14,410,000) (5,505,000)
Payment of contingent consideration from acquisition of business (6,250,000) (250,000) (250,000)
Payments for early extinguishment of long-term debt 0 0 (487,148,000)
Make-whole premium payment 0 0 (56,421,000)
Share repurchases (51,302,000) (247,213,000) (76,999,000)
Other 0 (540,000) (587,000)
Net cash provided by (used in) financing activities 986,507,000 (463,869,000) (734,305,000)
Net increase (decrease) in cash and cash equivalents and restricted cash 1,212,422,000 47,229,000 (667,707,000)
Cash and cash equivalents and restricted cash, beginning of period 316,238,000 269,009,000 936,716,000
Cash and cash equivalents and restricted cash, end of period 1,528,660,000 316,238,000 269,009,000
Cash paid (received) during the period:      
Interest paid 15,947,000 17,099,000 18,909,000
Income tax paid 181,349,000 199,139,000 17,731,000
Income tax received (1,224,000) (26,809,000) (62,000)
Payments for operating leases 13,260,000 12,441,000 11,233,000
Non-cash operating and investing activities:      
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment $ (20,454,000) $ (2,554,000) $ (2,425,000)