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Asset Retirement Obligations (Tables)
 12 Months Ended
Sep. 30, 2013
Asset Retirement Obligations [Abstract]  
Schedule Of Change In Asset Retirement Obligation

 

Year Ended September 30

 

2013

2012

2011

 

(Thousands)

Balance at Beginning of Year...........................................................................................................................................
$
119,246 
$
75,731 
$
101,618 

Liabilities Incurred and Revisions of Estimates...........................................................................................................
(4,796)
41,653 
10,346 

Liabilities Settled.............................................................................................................................................................
(1,744)
(2,997)
(41,704)

Accretion Expense...........................................................................................................................................................
6,805 
4,859 
5,471 

Balance at End of Year...................................................................................................................................................
$
119,511 
$
119,246 
$
75,731