CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands	9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash Flows From Operating Activities
Net income (loss)	$ 205,640	$ 204,302
Adjustments to reconcile net income to net cash provided by operating activities:
Asset impairments	30,270	0
Depreciation and amortization:
Charged to depreciation and amortization	171,726	160,207
Charged to other accounts	149	116
Other
Deferred income taxes	115,488	186,325
Other	15,927	18,425
Net assets / liabilities from risk management activities	(15,869)	3,429
Net change in operating assets and liabilities	(3,769)	21,760
Net cash provided by operating activities	519,562	594,564
Cash Flows From Investing Activities
Capital expenditures	(390,283)	(362,349)
Other, net	(3,373)	(438)
Net cash used in investing activities	(393,656)	(362,787)
Cash Flows From Financing Activities
Net increase in short-term debt	(132,072)	(76,019)
Net proceeds from issuance of long-term debt	394,618	0
Settlement of Treasury lock agreement	20,079	0
Unwinding of Treasury lock agreements	27,803	0
Repayment of long-term debt	(360,066)	(66)
Cash dividends paid	(93,039)	(93,913)
Repurchase of equity awards	(5,300)	(1,173)
Issuance of common stock	7,548	8,574
Net cash provided by (used in) financing activities	(140,429)	(162,597)
Net increase (decrease) in cash and cash equivalents	(14,523)	69,180
Cash and cash equivalents at beginning of period	131,952	111,203
Cash and cash equivalents at end of period	$ 117,429	$ 180,383