Summary Of Significant Accounting Policies (Schedule Of Other Accruals And Current Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Summary Of Significant Accounting Policies [Line Items]
Regulatory Liability	$ 51,817	$ 32,841
Other Accruals and Current Liabilities	136,672	83,946
Accrued Capital Expenditures [Member]
Summary Of Significant Accounting Policies [Line Items]
Other	80,348	41,100
Regulatory Liabilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Regulatory Liability	18,072	20,013
Other Accruals [Member]
Summary Of Significant Accounting Policies [Line Items]
Other	32,454	22,833
State [Member]
Summary Of Significant Accounting Policies [Line Items]
Income Taxes Payable	$ 5,798	$ 0