CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES:
Net income	$ 203,042	$ 173,182
Adjustment for loss from discontinued operations	15
Income from continuing operations	203,057	173,182
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	137,613	120,237
Stock-based compensation	6,982	7,010
Income from asset sales	(4,155)	(5,664)
Deferred income tax expense	129,548	1,943
Change in assets and liabilities:
Accounts receivable	(29,115)	(8,820)
Inventories	(4,532)	(8,469)
Prepaid expenses and other	(15,464)	20,003
Accounts payable	(4,373)	(25,701)
Accrued liabilities	(39,352)	38,705
Deferred income taxes	(229)	(1,317)
Other noncurrent liabilities	9,727	(6,251)
Net cash provided by operating activities from continuing operations	389,707	304,858
Net cash used in operating activities from discontinued operations	(15)
Net cash provided by operating activities	389,692	304,858
INVESTING ACTIVITIES:
Capital expenditures	(369,029)	(140,643)
Proceeds from asset sales	7,125	7,913
Net cash used in investing activities from continuing operations	(361,904)	(132,730)
FINANCING ACTIVITIES:
Dividends paid	(74,822)	(53,860)
Repurchase of common stock	(59,654)
Proceeds on short-term debt	1,002
Exercise of stock options, net of tax withholding	(2,062)	8,201
Tax withholdings related to net share settlements of restricted stock	(4,248)	(3,049)
Excess tax benefit from stock-based compensation	2,723	10,126
Net cash used in financing activities	(137,061)	(38,582)
Net increase (decrease) in cash and cash equivalents	(109,273)	133,546
Cash and cash equivalents, beginning of period	360,909	447,868
Cash and cash equivalents, end of period	$ 251,636	$ 581,414