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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2013
Site Contingency [Line Items]
Estimated minimum liability for environmental remediation	$ 16.5
Estimated maximum liability for environmental remediation	17.0
Rate recovery period	10 years
Former Manufactured Gas Plant Site [Member]
Site Contingency [Line Items]
Estimated minimum liability for environmental remediation	$ 13.9

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.