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Unaudited Financial Information (Table)
9 Months Ended
Jun. 30, 2017
Regulatory Assets And Liabilities Table [Abstract]  
Schedule Of Regulatory Assets And Liabilities [Table Text Block]
Significant regulatory assets and liabilities as of June 30, 2017 and September 30, 2016 included the following:
 
June 30,
2017
 
September 30,
2016
 
(In thousands)
Regulatory assets:
 
 
 
Pension and postretirement benefit costs(1)
$
122,202

 
$
132,348

Infrastructure mechanisms(2)
38,653

 
42,719

Deferred gas costs
16,405

 
45,184

Recoverable loss on reacquired debt
11,843

 
13,761

Deferred pipeline record collection costs
10,327

 
7,336

APT annual adjustment mechanism
4,973

 
7,171

Rate case costs
2,480

 
1,539

Other
9,949

 
13,565

 
$
216,832

 
$
263,623

Regulatory liabilities:
 
 
 
Regulatory cost of removal obligations
$
492,404

 
$
476,891

Deferred gas costs
16,753

 
20,180

Asset retirement obligations
13,404

 
13,404

Other
6,729

 
4,250

 
$
529,290

 
$
514,725


 
(1)
Includes $11.5 million and $12.4 million of pension and postretirement expense deferred pursuant to regulatory authorization.
(2)
Infrastructure mechanisms in Texas and Louisiana allow for the deferral of all eligible expenses associated with capital expenditures incurred pursuant to these rules, including the recording of interest on deferred expenses until the next rate proceeding (rate case or annual rate filing), at which time investment and costs would be recoverable through base rates.