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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ (389,935) $ 79,850
Adjustment for loss from discontinued operations 196 371
Income (loss) from continuing operations (389,739) 80,221
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 262,137 284,620
Asset impairment charge 563,234 0
Amortization of debt discount and debt issuance costs 900 752
Provision for (recovery of) bad debt 1,779 (75)
Stock-based compensation 20,952 16,589
Loss on investment securities 9,592 36,957
Gain on sale of assets (14,589) (17,090)
Gain on sale of subsidiary (14,963) 0
Deferred income tax (benefit) expense (106,878) 8,827
Other (3,779) (3,209)
Change in assets and liabilities increasing (decreasing) cash:    
Accounts receivable (37,717) 13,642
Inventories of materials and supplies (1,380) (3,268)
Prepaid expenses and other (15,962) 3,960
Other noncurrent assets 10,107 (4,602)
Accounts payable 21,764 (2,639)
Accrued liabilities (68,146) (456)
Deferred income tax liability 322 160
Other noncurrent liabilities (4,964) (5,326)
Net cash provided by operating activities from continuing operations 232,670 409,063
Net cash used in operating activities from discontinued operations (28) (45)
Net cash provided by operating activities 232,642 409,018
Cash flows from investing activities:    
Capital expenditures (94,312) (329,980)
Purchase of short-term investments (36,336) (42,406)
Payment for acquisition of business, net of cash acquired 0 (2,781)
Proceeds from sale of short-term investments 43,894 58,015
Proceeds from sale of subsidiary 15,056 0
Proceeds from asset sales 24,799 24,559
Other (51) 0
Net cash used in investing activities (46,950) (292,593)
Cash flows from financing activities:    
Dividends paid (155,890) (156,580)
Debt issuance costs paid 0 (3,912)
Proceeds from stock option exercises 4,100 2,257
Payments for employee taxes on net settlement of equity awards (3,455) (6,268)
Payment of contingent consideration from acquisition of business (4,250) 0
Share repurchases (28,504) 0
Other (445) 0
Net cash used in financing activities (188,444) (164,503)
Net decrease in cash and cash equivalents and restricted cash (2,752) (48,078)
Cash and cash equivalents and restricted cash, beginning of period 382,971 326,185
Cash and cash equivalents and restricted cash, end of period 380,219 278,107
Cash paid during the period:    
Interest paid 11,440 13,234
Income tax paid, net 43,509 9,127
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows for operating leases 9,626 0
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment $ 189 $ 12,734