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Summary Of Significant Accounting Policies (Component Of Other Accruals And Current Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Summary Of Significant Accounting Policies [Abstract]
Accrued Capital Expenditures	$ 36,460	$ 72,121
Regulatory Liability	38,253	29,368
Other	4,386	7,147
Total Other Accruals and Current Liabilities	$ 79,099	$ 108,636

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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