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Valuation And Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Valuation and Qualifying Accounts [Abstract]      
Balance at Beginning of Period $ 27,144 $ 30,317 $ 31,039
Additions Charged to Costs and Expenses 10,856 5,568 9,183
Additions Charged to Other Accounts 3,241 [1] 2,390 [1] 1,946 [1]
Deductions 9,430 [2] 11,131 [2] 11,851 [2]
Balance at End of Period $ 31,811 $ 27,144 $ 30,317
[1] Represents the discount on accounts receivable purchased in accordance with the Utility segment’s 2005 New York rate agreement.
[2] Amounts represent net accounts receivable written-off.