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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
NET LOSS $ (51,362) $ (70,431)
Adjustment for (income) loss from discontinued operations 31 (7,493)
Loss from continuing operations (51,331) (77,924)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 100,437 106,861
Asset impairment charge 4,363 0
Amortization of debt discount and debt issuance costs 239 460
Loss on extinguishment of debt 60,083 0
Provision for credit loss (112) (465)
Provision for obsolete inventory (708) 216
Stock-based compensation 6,218 7,451
Gain on investment securities (47,862) (2,924)
Gain on reimbursement of drilling equipment (5,254) (2,191)
Other (gain) loss on sale of assets 1,029 (10,145)
Deferred income tax benefit (17,750) (15,016)
Other (3,781) 1,458
Change in assets and liabilities:    
Accounts receivable (54,641) (32,586)
Inventories of materials and supplies (2,507) 4,612
Prepaid expenses and other 4,099 (5,935)
Other noncurrent assets 3,930 1,629
Accounts payable 36,041 9,738
Accrued liabilities (17,592) (6,674)
Deferred income tax liability 69 16
Other noncurrent liabilities (18,675) 1,818
Net cash used in operating activities from continuing operations (3,705) (19,601)
Net cash used in operating activities from discontinued operations (13) (3)
Net cash used in operating activities (3,718) (19,604)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (44,014) (13,985)
Other capital expenditures related to assets held-for-sale (3,877) 0
Purchase of short-term investments (47,083) (94,151)
Purchase of long-term investments (9,015) (1,000)
Proceeds from sale of short-term investments 37,777 37,097
Proceeds from asset sales 21,483 6,836
Net cash used in investing activities (44,729) (65,203)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividends paid (27,320) (26,918)
Payments for employee taxes on net settlement of equity awards (4,113) (2,119)
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 (60,358) 0
Net cash used in financing activities (635,610) (29,287)
Net decrease in cash and cash equivalents and restricted cash (684,057) (114,094)
Cash and cash equivalents and restricted cash, beginning of period 936,716 536,747
Cash and cash equivalents and restricted cash, end of period 252,659 422,653
Cash paid during the period:    
Interest paid 2,673 77
Income tax paid (received), net 97 (190)
Payments for operating leases 3,657 3,986
Non-cash operating and investing activities:    
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment (1,820) (369)
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)