CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) (USD $) In Thousands	9 Months Ended
Jun. 30, 2011	Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 108,810	$ 115,942
Adjustments to reconcile net income to cash flows from operating activities:
Unrealized loss on derivative instruments	53,503	6,186
Depreciation and amortization	25,445	24,628
Allowance for equity used during construction	(1,252)	(1,474)
Allowance for bad debt expense	3,365	2,277
Deferred income taxes	22,110	69,329
Manufactured gas plant remediation costs	(10,818)	(2,925)
Equity in earnings of affiliates, net of distributions received	(470)	(2,261)
Cost of removal - asset retirement obligations	(711)	(676)
Contributions to postemployment benefit plans	(9,591)	(7,866)
Changes in:
Components of working capital	5,311	(54,205)
Other noncurrent assets	11,951	9,891
Other noncurrent liabilities	19,568	(2,902)
Cash flows from operating activities	227,221	155,944
CASH FLOWS (USED IN) INVESTING ACTIVITIES
Utility plant expenditures	(69,894)	(49,696)
Solar equipment expenditures	(17,529)	0
Real estate properties and other expenditures	(2,423)	(460)
Cost of removal expenditures	(8,075)	(6,252)
Investments in equity investees	0	(4,300)
Withdrawal from restricted cash construction fund	67	0
Cash flows (used in) investing activities	(97,854)	(60,708)
CASH FLOWS (USED IN) FINANCING ACTIVITIES
Proceeds from issuance of common stock	10,507	6,414
Tax benefit from stock options exercised	355	(96)
Proceeds from sale-leaseback transaction	5,901	4,925
Payments of long-term debt	(25,690)	(4,683)
Purchases of treasury stock	(7,222)	(28,069)
Payments of common stock dividends	(43,747)	(39,160)
Net (payments) proceeds of short-term debt	(9,600)	20,900
Cash flows (used in) financing activities	(69,496)	(39,769)
Change in cash and temporary investments	59,871	55,467
Cash and temporary investments at beginning of period	943	36,186
Cash and temporary investments at end of period	60,814	91,653
CHANGES IN COMPONENTS OF WORKING CAPITAL
Receivables	(97,566)	(82,253)
Inventories	87,210	18,222
Recovery of gas costs	36,329	(77,529)
Gas purchases payable	12,856	90,976
Prepaid and accrued taxes	15,654	(14,093)
Accounts payable and other	11,857	330
Restricted broker margin accounts	(36,544)	24,172
Customers' credit balances and deposits	(16,341)	(17,137)
Other current assets	(8,144)	3,107
Components of working capital	5,311	(54,205)
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION
Cash paid for Interest (net of amounts capitalized)	9,778	10,426
Cash paid for Income taxes	$ 4,138	$ 23,811

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Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows.

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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The increase (decrease) during the reporting period in cash and cash equivalents. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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The increase (decrease) during the reporting period in other noncurrent operating assets not separately disclosed in the statement of cash flows.

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The increase (decrease) during the reporting period in other noncurrent operating liabilities not separately disclosed in the statement of cash flows.

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