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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:      
NET INCOME (LOSS) $ 6,953 $ (326,150) $ (494,497)
Adjustment for income from discontinued operations (401) (11,309) (1,895)
Income (loss) from continuing operations 6,552 (337,459) (496,392)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 403,170 419,726 481,885
Asset impairment charges 4,363 70,850 563,234
Amortization of debt discount and debt issuance costs 1,200 1,423 1,817
Loss on extinguishment of debt 60,083 0 0
Provision for credit loss 1,081 203 2,203
Stock-based compensation 28,032 27,858 36,329
Loss (gain) on investment securities (57,937) (6,727) 8,720
Gain on reimbursement of drilling equipment (29,443) (12,322) (26,959)
Other (gain) loss on sale of assets (5,432) 11,280 (19,816)
Gain on sale of subsidiary 0 0 (14,963)
Deferred income tax benefit (28,488) (89,752) (157,555)
Other 6,533 13,794 (2,423)
Change in assets and liabilities:      
Accounts receivable (235,562) (28,416) 300,807
Inventories of materials and supplies (5,228) 19,847 9,420
Prepaid expenses and other 6,224 (21,400) (5,506)
Other noncurrent assets 2,581 2,772 2,820
Accounts payable 53,242 31,027 (9,414)
Accrued liabilities 45,069 33,957 (138,414)
Deferred income tax liability 447 1,101 908
Other noncurrent liabilities (22,501) (1,274) 2,227
Net cash provided by operating activities from continuing operations 233,986 136,488 538,928
Net cash used in operating activities from discontinued operations (73) (48) (47)
Net cash provided by operating activities 233,913 136,440 538,881
CASH FLOWS FROM INVESTING ACTIVITIES:      
Capital expenditures (250,894) (82,148) (140,795)
Other capital expenditures related to assets held-for-sale (21,645) 0 0
Purchase of short-term investments (165,109) (315,078) (134,641)
Purchase of long-term investments (51,241) (102,523) (550)
Proceeds from sale of short-term investments 244,728 207,716 94,646
Proceeds from sale of long-term investments 22,042 0 0
Proceeds from sale of subsidiary 0 0 15,056
Proceeds from asset sales 62,304 43,515 78,399
Advance payment for sale of property, plant and equipment 0 86,524 0
Other (7,500) 0 0
Net cash used in investing activities (167,315) (161,994) (87,885)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Dividends paid (107,395) (109,130) (260,335)
Proceeds from debt issuance 0 548,719 0
Debt issuance costs 0 (3,935) 0
Proceeds from stock option exercises 0 0 4,100
Payments for employee taxes on net settlement of equity awards (5,505) (2,162) (3,784)
Payment of contingent consideration from acquisition of business (250) (7,250) (8,250)
Payments for early extinguishment of long-term debt (487,148) 0 0
Make-whole premium payment (56,421) 0 0
Share repurchases (76,999) 0 (28,505)
Other (587) (719) (446)
Net cash provided by (used in) financing activities (734,305) 425,523 (297,220)
Net increase (decrease) in cash and cash equivalents and restricted cash (667,707) 399,969 153,776
Cash and cash equivalents and restricted cash, beginning of period 936,716 536,747 382,971
Cash and cash equivalents and restricted cash, end of period 269,009 936,716 536,747
Cash paid during the period:      
Interest paid 18,909 26,706 22,928
Income tax paid (received), net 17,669 (32,462) 46,700
Payments for operating leases 11,233 17,266 18,646
Non-cash operating and investing activities:      
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment (2,425) (1,526) 3,123
Changes in accounts receivable, property, plant and equipment and other noncurrent assets related to the sale of equipment 0 9,290 0
Cumulative effect adjustment for adoption of ASU No. 2016-13 $ 0 $ (1,251) $ 0