Income Taxes (Narrative) (Details) (USD $)	3 Months Ended
	Dec. 31, 2011	Sep. 30, 2011
Income Taxes [Line Items]
Taxes Refundable to Customers	$ 65,547,000	$ 65,543,000
Recoverable Future Taxes	145,469,000	144,377,000
Tax benefit total not realized due to tax loss carryforwards	14,200,000	18,100,000
Deferred Income Taxes [Member]
Income Taxes [Line Items]
Taxes Refundable to Customers	65,500,000	65,500,000
Recoverable Future Taxes	$ 145,500,000	$ 144,400,000