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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:    
Net income $ 30,605 $ 18,959
Adjustment for (income) loss from discontinued operations 124 (10,595)
Income from continuing operations 30,729 8,364
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 130,131 141,460
Amortization of debt discount and debt issuance costs 444 329
Provision for bad debt (2,069) 873
Stock-based compensation 10,201 7,158
(Gain) loss on investment securities (2,821) 42,844
Gain on sale of assets (4,279) (5,545)
Gain on sale of subsidiary (14,963) 0
Deferred income tax (benefit) expense (7,966) 1,107
Other (139) 168
Change in assets and liabilities increasing (decreasing) cash:    
Accounts receivable (3,269) 19,700
Inventories of materials and supplies 965 (1,858)
Prepaid expenses and other (19,699) 64
Other noncurrent assets 6,367 (273)
Accounts payable (1,580) 8,012
Accrued liabilities (8,093) (2,919)
Deferred income tax liability 6 (306)
Other noncurrent liabilities (2,184) (9,670)
Net cash provided by operating activities from continuing operations 111,781 209,508
Net cash used in operating activities from discontinued operations 0 (26)
Net cash provided by operating activities 111,781 209,482
Cash flows from investing activities:    
Capital expenditures (46,021) (196,094)
Purchase of short-term investments (28,948) (31,324)
Payment for acquisition of business, net of cash acquired 0 (2,781)
Proceeds from sale of short-term investments 25,000 31,860
Proceeds from sale of subsidiary 15,056 0
Proceeds from asset sales 11,878 11,609
Net cash used in investing activities (23,035) (186,730)
Cash flows from financing activities:    
Dividends paid (77,602) (78,122)
Debt issuance costs paid 0 (3,912)
Proceeds from stock option exercises 4,100 1,954
Payments for employee taxes on net settlement of equity awards (3,455) (6,267)
Other (445) 0
Net cash used in financing activities (77,402) (86,347)
Net increase (decrease) in cash and cash equivalents and restricted cash 11,344 (63,595)
Cash and cash equivalents and restricted cash, beginning of period 382,971 326,185
Cash and cash equivalents and restricted cash, end of period 394,315 262,590
Cash paid during the period:    
Interest paid 46 6,140
Income tax paid, net 934 5,710
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows for operating leases 4,877  
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment $ (1,339) $ 8,708