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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ 434,100 $ 6,953 $ (326,150)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 382,314 403,170 419,726
Asset impairment charges 12,097 4,363 70,850
Amortization of debt discount and debt issuance costs 1,079 1,200 1,423
Loss on extinguishment of debt 0 60,083 0
Stock-based compensation 32,456 28,032 27,858
Gain on investment securities (11,299) (57,937) (6,727)
Gain on reimbursement of drilling equipment (48,173) (29,443) (12,322)
Other (gain) loss on sale of assets 8,016 (5,432) 11,280
Deferred income tax benefit (20,400) (28,488) (89,752)
Other 8,979 7,140 2,640
Change in assets and liabilities:      
Accounts receivable 56,281 (235,562) (28,416)
Inventories of materials and supplies (7,826) (5,228) 19,847
Prepaid expenses and other (1,803) 6,224 (21,400)
Other noncurrent assets (11,135) 2,581 2,772
Accounts payable 4,237 53,242 31,027
Accrued liabilities (10,139) 45,069 33,957
Deferred income tax liability (692) 447 1,101
Other noncurrent liabilities 5,590 (22,501) (1,274)
Net cash provided by operating activities 833,682 233,913 136,440
CASH FLOWS FROM INVESTING ACTIVITIES:      
Capital expenditures (395,460) (250,894) (82,148)
Other capital expenditures related to assets held-for-sale 0 (21,645) 0
Purchase of short-term investments (180,993) (165,109) (315,078)
Purchase of long-term investments (20,748) (51,241) (102,523)
Proceeds from sale of short-term investments 195,311 244,728 207,716
Proceeds from sale of long-term investments 0 22,042 0
Proceeds from asset sales 70,085 62,304 43,515
Insurance proceeds from involuntary conversion 9,221 0 0
Advance payment for sale of property, plant and equipment 0 0 86,524
Other 0 (7,500) 0
Net cash used in investing activities (322,584) (167,315) (161,994)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Dividends paid (201,456) (107,395) (109,130)
Proceeds from debt issuance 0 0 548,719
Debt issuance costs 0 0 (3,935)
Payments for employee taxes on net settlement of equity awards (14,410) (5,505) (2,162)
Payment of contingent consideration from acquisition of business (250) (250) (7,250)
Payments for early extinguishment of long-term debt 0 (487,148) 0
Make-whole premium payment 0 (56,421) 0
Share repurchases (247,213) (76,999) 0
Other (540) (587) (719)
Net cash provided by (used in) financing activities (463,869) (734,305) 425,523
Net increase (decrease) in cash and cash equivalents and restricted cash 47,229 (667,707) 399,969
Cash and cash equivalents and restricted cash, beginning of period 269,009 936,716 536,747
Cash and cash equivalents and restricted cash, end of period 316,238 269,009 936,716
Cash paid (received) during the period:      
Interest paid 17,099 18,909 26,706
Income tax paid 199,139 17,731 1,456
Income tax received (26,809) (62) (33,918)
Payments for operating leases 12,441 11,233 17,266
Non-cash operating and investing activities:      
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment (2,554) (2,425) (1,526)
Changes in accounts receivable, property, plant and equipment and other noncurrent assets related to the sale of equipment 0 0 9,290
Cumulative effect adjustment for adoption of ASU No. 2016-13 $ 0 $ 0 $ (1,251)