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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
Regulatory Asset [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
BEGINNING BALANCE   $ 71 $ 141
ADDITIONS, CHARGED TO EXPENSE   (71) (70)
OTHER   0 [1] 0 [1]
ENDING BALANCE   0 71
Allowance for Doubtful Accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
BEGINNING BALANCE 5,330 4,797 4,612
ADDITIONS, CHARGED TO EXPENSE 2,504 2,627 3,932
OTHER (2,477) [1] (2,094) [1] (3,747) [1]
ENDING BALANCE $ 5,357 $ 5,330 $ 4,797
[1] Uncollectible accounts written off, less recoveries and adjustments.