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Other Income, Net (Tables)
 12 Months Ended
Sep. 30, 2012
Other Income [Abstract]  
Other income, net
Other income, net, comprises the following:
 
2012
 
2011
 
2010
Non-tariff service income
$
2,653

 
$
6,422

 
$
2,437

Interest income
572

 
467

 
867

Postretirement benefit plan curtailment gain
—

 
3,245

 
—

Other, net
1,764

 
630

 
2,965

Total other income, net
$
4,989

 
$
10,764

 
$
6,269