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Asset Retirement Obligations (Tables)
 12 Months Ended
Sep. 30, 2018
Asset Retirement Obligation [Abstract]  
Schedule Of Change In Asset Retirement Obligation
The following is a reconciliation of the change in the Company’s asset retirement obligations:
 
Year Ended September 30
 
2018
 
2017
 
2016
 
(Thousands)
Balance at Beginning of Year
$
106,395

 
$
112,330

 
$
156,805

Liabilities Incurred
5,597

 
2,963

 
2,719

Revisions of Estimates
(419
)
 
(10,578
)
 
16,721

Liabilities Settled
(12,858
)
 
(4,967
)
 
(72,215
)
Accretion Expense
9,520

 
6,647

 
8,300

Balance at End of Year
$
108,235

 
$
106,395

 
$
112,330