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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
NET INCOME (LOSS) $ (38,586) $ (246,989)
Adjustment for (income) loss from discontinued operations 106 (10,936)
Loss from continuing operations (38,480) (257,925)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 304,115 317,771
Asset impairment charge 4,363 56,414
Amortization of debt discount and debt issuance costs 880 994
Loss on extinguishment of debt 60,083 0
Provision for credit loss 1,022 8
Stock-based compensation 21,214 21,240
Gain on investment securities (55,684) (7,853)
Gain on reimbursement of drilling equipment (21,597) (10,207)
Other (gain) loss on sale of assets (2,762) 12,952
Deferred income tax benefit (36,614) (66,102)
Other (2,765) 8,849
Change in assets and liabilities:    
Accounts receivable (173,625) (33,075)
Inventories of materials and supplies (2,482) 14,073
Prepaid expenses and other 9,209 (1,638)
Other noncurrent assets 1,829 (3,337)
Accounts payable 46,775 24,908
Accrued liabilities 22,511 8,643
Deferred income tax liability 454 (36)
Other noncurrent liabilities (21,745) 4,183
Net cash provided by operating activities from continuing operations 116,701 89,862
Net cash used in operating activities from discontinued operations (60) (41)
Net cash provided by operating activities 116,641 89,821
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (174,958) (49,173)
Other capital expenditures related to assets held-for-sale (18,228) 0
Purchase of short-term investments (109,318) (234,465)
Purchase of long-term investments (47,210) (2,319)
Proceeds from sale of short-term investments 161,766 139,430
Proceeds from sale of long-term investments 22,042 0
Proceeds from asset sales 50,260 26,775
Other (7,500) 0
Net cash used in investing activities (123,146) (119,752)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividends paid (80,702) (81,815)
Payments for employee taxes on net settlement of equity awards (5,515) (2,160)
Payment of contingent consideration from acquisition of business (250) (250)
Payments for early extinguishment of long-term debt (487,148) 0
Make-whole premium payment (56,421) 0
Share repurchases (76,999) 0
Other (587) (719)
Net cash used in financing activities (707,622) (84,944)
Net decrease in cash and cash equivalents and restricted cash (714,127) (114,875)
Cash and cash equivalents and restricted cash, beginning of period 936,716 536,747
Cash and cash equivalents and restricted cash, end of period 222,589 421,872
Cash paid during the period:    
Interest paid 10,889 11,642
Income tax paid (received), net 3,392 (31,826)
Cash paid for amounts included in the measurement of lease liabilities:    
Payments for operating leases 9,255 13,353
Non-cash operating and investing activities:    
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment (4,260) (746)
Changes in accounts receivable, property, plant and equipment and other noncurrent assets related to the sale of equipment 0 9,290
Cumulative effect adjustment for adoption of ASU No. 2016-13 $ 0 $ (1,251)