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Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2012
Accounting Policies [Abstract]  
Components of AOCI
The components of AOCI at September 30, 2012 and 2011, follow:
 
Postretirement
Benefit Plans
 
Derivative
Instruments Net
Losses
 
Total
September 30, 2012
$
(10,756
)
 
$
(19,061
)
 
$
(29,817
)
September 30, 2011
$
(8,377
)
 
$
(13,456
)
 
$
(21,833
)