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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:      
NET LOSS $ (326,150) $ (494,497) $ (33,656)
Adjustment for (income) loss from discontinued operations (11,309) (1,895) 1,146
Loss from continuing operations (337,459) (496,392) (32,510)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation and amortization 419,726 481,885 562,803
Asset impairment charges 70,850 563,234 224,327
Amortization of debt discount and debt issuance costs 1,423 1,817 1,732
Provision for credit loss 203 2,203 2,321
Stock-based compensation 27,858 36,329 34,292
Loss (gain) on investment securities (6,727) 8,720 54,488
Gain on sale of assets (1,042) (46,775) (39,691)
Gain on sale of subsidiary 0 (14,963) 0
Deferred income tax benefit (89,752) (157,555) (44,554)
Other 13,794 (2,423) 4,431
Change in assets and liabilities:      
Accounts receivable (28,416) 300,807 70,323
Inventories of materials and supplies 19,847 9,420 (5,905)
Prepaid expenses and other (21,400) (5,506) (176)
Other noncurrent assets 2,772 2,820 (10,430)
Accounts payable 31,027 (9,414) (9,147)
Accrued liabilities 33,957 (138,414) 40,887
Deferred income tax liability 1,101 908 371
Other noncurrent liabilities (1,274) 2,227 2,251
Net cash provided by operating activities from continuing operations 136,488 538,928 855,813
Net cash used in operating activities from discontinued operations (48) (47) (62)
Net cash provided by operating activities 136,440 538,881 855,751
CASH FLOWS FROM INVESTING ACTIVITIES:      
Capital expenditures (82,148) (140,795) (458,402)
Purchase of investments (417,601) (134,641) (97,652)
Payment for acquisition of business, net of cash acquired 0 0 (16,163)
Proceeds from sale of investments 207,716 94,646 98,764
Proceeds from sale of subsidiary 0 15,056 0
Proceeds from asset sales 43,515 78,399 50,817
Advance payment for sale of property, plant and equipment 86,524 0 0
Other 0 (550) 0
Net cash used in investing activities (161,994) (87,885) (422,636)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Dividends paid (109,130) (260,335) (313,421)
Proceeds from debt issuance 548,719 0 0
Debt issuance costs (3,935) 0 (3,912)
Proceeds from stock option exercises 0 4,100 3,053
Payments for employee taxes on net settlement of equity awards (2,162) (3,784) (6,418)
Payment of contingent consideration from acquisition of business (7,250) (8,250) 0
Payments for early extinguishment of long-term debt 0 0 (12,852)
Share repurchases 0 (28,505) (42,779)
Other (719) (446) 0
Net cash provided by (used in) financing activities 425,523 (297,220) (376,329)
Net increase in cash and cash equivalents and restricted cash 399,969 153,776 56,786
Cash and cash equivalents and restricted cash, beginning of period 536,747 382,971 326,185
Cash and cash equivalents and restricted cash, end of period 936,716 536,747 382,971
Cash paid during the period:      
Interest paid 26,706 22,928 26,739
Income tax paid (received), net (32,462) 46,700 16,218
Payments for operating leases 17,266 18,646 0
Non-cash operating and investing activities:      
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment (1,526) 3,123 17,771
Changes in accounts receivable, property, plant and equipment and other noncurrent assets related to the sale of equipment 9,290 0 0
Cumulative effect adjustment for adoption of ASU No. 2016-13 $ (1,251) $ 0 $ 0