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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table provides a disaggregation of the Company's revenues for the year ended September 30, 2019, presented by type of service from each reportable segment.
 
Year Ended September 30, 2019
Revenues by Type of Service
Exploration
and
Production
 
Pipeline
and
Storage
 
Gathering
 
Utility
 
Total
Reportable
Segments
 
All
Other
 
Corporate
and
Intersegment
Eliminations
 
Total
Consolidated
 
(Thousands)
Production of Natural Gas
$
481,048

 
$
—

 
$
—

 
$
—

 
$
481,048

 
$
—

 
$
—

 
$
481,048

Production of Crude Oil
149,078

 
—

 
—

 
—

 
149,078

 
—

 
—

 
149,078

Natural Gas Processing
3,277

 
—

 
—

 
—

 
3,277

 
—

 
—

 
3,277

Natural Gas Gathering Service
—

 
—

 
127,064

 
—

 
127,064

 
—

 
(127,064
)
 
—

Natural Gas Transportation Service
—

 
209,184

 
—

 
119,253

 
328,437

 
—

 
(70,689
)
 
257,748

Natural Gas Storage Service
—

 
75,484

 
—

 
—

 
75,484

 
—

 
(32,488
)
 
42,996

Natural Gas Residential Sales
—

 
—

 
—

 
539,962

 
539,962

 
—

 
—

 
539,962

Natural Gas Commercial Sales
—

 
—

 
—

 
73,331

 
73,331

 
—

 
—

 
73,331

Natural Gas Industrial Sales
—

 
—

 
—

 
4,830

 
4,830

 
—

 
—

 
4,830

Natural Gas Marketing
—

 
—

 
—

 
—

 
—

 
143,627

 
(1,127
)
 
142,500

Other
1,609

 
3,615

 
11

 
(8,630
)
 
(3,395
)
 
3,424

 
(549
)
 
(520
)
Total Revenues from Contracts with Customers
635,012

 
288,283

 
127,075

 
728,746

 
1,779,116

 
147,051

 
(231,917
)
 
1,694,250

Alternative Revenue Programs
—

 
—

 
—

 
(1,304
)
 
(1,304
)
 
—

 
—

 
(1,304
)
Derivative Financial Instruments
(2,272
)
 
—

 
—

 
—

 
(2,272
)
 
2,658

 
—

 
386

Total Revenues
$
632,740

 
$
288,283

 
$
127,075

 
$
727,442

 
$
1,775,540

 
$
149,709

 
$
(231,917
)
 
$
1,693,332