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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ (33,656)	$ 482,672	$ (128,212)
Adjustment for loss from discontinued operations	1,146	10,338	349
Income (loss) from continuing operations	(32,510)	493,010	(127,863)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	562,803	583,802	585,543
Asset impairment charge	224,327	23,128	0
Amortization of debt discount and debt issuance costs	1,732	1,067	1,055
Provision for bad debt	2,321	2,193	2,016
Stock-based compensation	34,292	31,687	26,183
Pension settlement charge	1,953	913	1,640
Loss (gain) on investment securities	54,488	(1)	0
Gain on sale of assets	(39,691)	(22,660)	(20,627)
Deferred income tax benefit	(44,554)	(486,758)	(24,111)
Other	(5,248)	6,710	543
Change in assets and liabilities increasing (decreasing) cash:
Accounts receivable	70,323	(85,202)	(97,114)
Inventories of materials and supplies	1,821	(22,427)	(10,607)
Prepaid expenses and other	(176)	(3,827)	29,452
Other noncurrent assets	(10,430)	5,568	11,550
Accounts payable	(9,147)	(4,461)	39,412
Accrued liabilities	40,887	43,798	(36,120)
Deferred income tax liability	371	2,268	3,472
Other noncurrent liabilities	2,251	(10,787)	(13,075)
Net cash provided by operating activities from continuing operations	855,813	558,021	371,349
Net cash used in operating activities from discontinued operations	(62)	(169)	(150)
Net cash provided by operating activities	855,751	557,852	371,199
Cash flows from investing activities:
Capital expenditures	(458,402)	(466,584)	(397,567)
Purchase of short-term investments	(97,652)	(71,049)	(69,866)
Payment for acquisition of business, net of cash acquired	(16,163)	(47,886)	(70,416)
Proceeds from sale of short-term investments	86,765	68,776	69,449
Proceeds from sale of marketable securities	11,999	0	0
Proceeds from asset sales	50,817	44,381	23,412
Net cash used in investing activities	(422,636)	(472,362)	(444,988)
Cash flows from financing activities:
Dividends paid	(313,421)	(308,430)	(305,515)
Debt issuance costs	(3,912)	0	0
Proceeds from stock option exercises	3,053	6,355	11,285
Payments for employee taxes on net settlement of equity awards	(6,418)	(7,114)	(6,599)
Payment of contingent consideration from acquisition of business	0	(10,625)	0
Payments for early extinguishment of long term debt	(12,852)	0	0
Share repurchase	(42,779)	0	0
Net cash used in financing activities	(376,329)	(319,814)	(300,829)
Net increase (decrease) in cash and cash equivalents and restricted cash	56,786	(234,324)	(374,618)
Cash and cash equivalents and restricted cash, beginning of period	326,185	560,509	935,127
Cash and cash equivalents and restricted cash, end of period	382,971	326,185	560,509
Cash paid during the period:
Interest paid	26,739	20,502	22,936
Income tax paid (refund), net	16,218	(38,400)	(23,463)
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment	$ 17,771	$ (2,245)	$ (10,539)

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