CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES:
Net income (loss)	$ (105,680)	$ 16,007
Adjustment for (income) loss from discontinued operations	(472)	3,872
Income (loss) from continuing operations	(106,152)	19,879
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	431,667	422,336
Asset impairment charge		6,250
Amortization of debt discount and debt issuance costs	789	879
Provision (recovery) for bad debt	3,858	(3,067)
Stock-based compensation	19,247	19,661
Pension settlement charge	1,411	3,343
Income from asset sales	(17,593)	(7,820)
Deferred income tax expense	(27,798)	77,886
Other	62	255
Change in assets and liabilities:
Accounts receivable	(62,942)	97,698
Inventories	(11,806)	(344)
Prepaid expenses and other	26,820	(6,537)
Accounts payable	41,398	(13,643)
Accrued liabilities	(53,456)	14,632
Deferred income taxes	(1,051)	2,673
Other noncurrent liabilities	(8,205)	(18,741)
Net cash provided by operating activities from continuing operations	236,249	615,340
Net cash provided by (used in) operating activities from discontinued operations	(115)	70
Net cash provided by operating activities	236,134	615,410
INVESTING ACTIVITIES:
Capital expenditures	(300,275)	(219,549)
Purchase of short-term investments	(48,958)	(36,958)
Payment for acquisition of business, net of cash acquired	(70,416)
Proceeds from sale of short-term investments	53,150	32,681
Proceeds from asset sales	17,921	12,804
Net cash used in investing activities	(348,578)	(211,022)
FINANCING ACTIVITIES:
Debt issuance costs		(32)
Dividends paid	(229,061)	(224,040)
Exercise of stock options, net of tax withholding	10,458	483
Tax withholdings related to net share settlements of restricted stock	(5,848)	(3,912)
Excess tax benefit from stock-based compensation	4,121	761
Net cash used in financing activities	(220,330)	(226,740)
Net increase (decrease) in cash and cash equivalents	(332,774)	177,648
Cash and cash equivalents, beginning of period	905,561	729,384
Cash and cash equivalents, end of period	$ 572,787	$ 907,032