CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities
Net income (loss)	$ 87,016	$ 80,465
Depreciation and amortization:
Charged to depreciation and amortization	60,469	60,500
Charged to other accounts	221	128
Other
Deferred income taxes	47,127	45,951
Other	5,228	3,242
Net Assets Liabilities From Risk Management Activities	(5,477)	(15,641)
Net change in operating assets and liabilities	(160,284)	(144,787)
Net cash provided by operating activities	34,300	29,858
Cash Flows From Investing Activities
Capital expenditures	(180,567)	(190,027)
Other, net	(5,867)	(1,273)
Net cash used in investing activities	(186,434)	(191,300)
Cash Flows From Financing Activities
Net decrease in short-term debt	320,783	256,933
Cash dividends paid	(33,984)	(31,992)
Repurchase of equity awards	(6,289)	(3,124)
Other	(12)	(13)
Net cash provided by (used in) financing activities	280,498	221,804
Net increase (decrease) in cash and cash equivalents	128,364	60,362
Cash and cash equivalents at beginning of period	66,199	64,239
Cash and cash equivalents at end of period	$ 194,563	$ 124,601