CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES:
Net income	$ 347,752	$ 310,683
Adjustment for (income) loss from discontinued operations	19	(5)
Income from continuing operations	347,771	310,678
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	244,200	219,032
Provision for bad debt	(194)	3,792
Stock-based compensation	12,804	11,726
Other		772
Gain on sale of investment securities	(21,352)	(8,752)
Income from asset sales	(9,762)	(10,532)
Deferred income tax expense	13,751	20,127
Change in assets and liabilities:
Accounts receivable	(2,494)	13,459
Inventories	(10,963)	(6,148)
Prepaid expenses and other	21,815	31,046
Accounts payable	(25,337)	(70,000)
Accrued liabilities	(19,017)	(7,826)
Deferred income taxes	(1,109)	(1,211)
Other noncurrent liabilities	(10,083)	(11,855)
Net cash provided by operating activities from continuing operations	540,030	494,308
Net cash provided by (used in) operating activities from discontinued operations	(19)	5
Net cash provided by operating activities	540,011	494,313
INVESTING ACTIVITIES:
Capital expenditures	(356,753)	(438,473)
Proceeds from sale of investment securities	23,338	18,102
Proceeds from asset sales	13,321	16,151
Net cash used in investing activities	(320,094)	(404,220)
FINANCING ACTIVITIES:
Dividends paid	(121,545)	(23,469)
Exercise of stock options	19,701	4,906
Tax withholdings related to net share settlements of restricted stock	(3,049)	(1,677)
Excess tax benefit from stock-based compensation	22,087	7,045
Net cash used in financing activities	(82,806)	(13,195)
Net increase in cash and cash equivalents	137,111	76,898
Cash and cash equivalents, beginning of period	447,868	96,095
Cash and cash equivalents, end of period	$ 584,979	$ 172,993