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Revenue from Contracts with Customers
 9 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers Revenue from Contracts with Customers
 
        The Company adopted authoritative guidance regarding revenue recognition on October 1, 2018 using the modified retrospective method of adoption for open contracts as of October 1, 2018. A cumulative effect adjustment to retained earnings was not necessary since no revenue recognition differences were identified when comparing the revenue recognition criteria under the new authoritative guidance to the previous guidance. The Company records revenue related to its derivative financial instruments in the Exploration and Production segment as well as in its NFR operations (included in the All Other category). The Company also records revenue related to alternative revenue programs in its Utility segment. Revenue related to derivative financial instruments and alternative revenue programs are excluded from the scope of the new authoritative guidance since they are accounted for under other existing accounting guidance.

        The following tables provide a disaggregation of the Company's revenues for the quarter and nine months ended June 30, 2020 and 2019, presented by type of service from each reportable segment. As reported in the Company's 2019 Form 10-K, the Company's NFR operations were previously reported as the Energy Marketing segment, however the Company is no longer reporting the energy marketing operations as a separate reportable segment. Prior year disaggregation of revenue information shown below has been restated to reflect this change in presentation.
Quarter Ended June 30, 2020 (Thousands)   
Revenues By Type of ServiceExploration and ProductionPipeline and StorageGatheringUtilityAll OtherCorporate and Intersegment EliminationsTotal Consolidated
Production of Natural Gas$76,831  $—  $—  $—  $—  $—  $76,831  
Production of Crude Oil17,018  —  —  —  —  —  17,018  
Natural Gas Processing435  —  —  —  —  —  435  
Natural Gas Gathering Services—  —  33,299  —  —  (33,299) —  
Natural Gas Transportation Service—  57,563  —  22,473  —  (20,445) 59,591  
Natural Gas Storage Service—  20,016  —  —  —  (8,802) 11,214  
Natural Gas Residential Sales—  —  —  93,853  —  —  93,853  
Natural Gas Commercial Sales—  —  —  10,264  —  —  10,264  
Natural Gas Industrial Sales—  —  —  616  —  —  616  
Natural Gas Marketing—  —  —  —  19,149  (341) 18,808  
Other218  234  —  (661) 1,015  (98) 708  
Total Revenues from Contracts with Customers94,502  77,813  33,299  126,545  20,164  (62,985) 289,338  
Alternative Revenue Programs—  —  —  492  —  —  492  
Derivative Financial Instruments36,726  —  —  —  (3,537) —  33,189  
Total Revenues$131,228  $77,813  $33,299  $127,037  $16,627  $(62,985) $323,019  
Nine Months Ended June 30, 2020 (Thousands)   
Revenues By Type of ServiceExploration and ProductionPipeline and StorageGatheringUtilityAll OtherCorporate and Intersegment EliminationsTotal Consolidated
Production of Natural Gas$297,481  $—  $—  $—  $—  $—  $297,481  
Production of Crude Oil84,949  —  —  —  —  —  84,949  
Natural Gas Processing1,838  —  —  —  —  —  1,838  
Natural Gas Gathering Services—  —  103,355  —  —  (103,355) —  
Natural Gas Transportation Service—  169,469  —  95,112  —  (59,408) 205,173  
Natural Gas Storage Service—  58,966  —  —  —  (25,881) 33,085  
Natural Gas Residential Sales—  —  —  423,547  —  —  423,547  
Natural Gas Commercial Sales—  —  —  56,401  —  —  56,401  
Natural Gas Industrial Sales—  —  —  3,029  —  —  3,029  
Natural Gas Marketing—  —  —  —  89,662  (598) 89,064  
Other797  843  —  (7,509) 2,985  (216) (3,100) 
Total Revenues from Contracts with Customers385,065  229,278  103,355  570,580  92,647  (189,458) 1,191,467  
Alternative Revenue Programs—  —  —  7,775  —  —  7,775  
Derivative Financial Instruments67,663  —  —  —  (8,604) —  59,059  
Total Revenues$452,728  $229,278  $103,355  $578,355  $84,043  $(189,458) $1,258,301  
Quarter Ended June 30, 2019 (Thousands)   
Revenues By Type of ServiceExploration and ProductionPipeline and StorageGatheringUtilityAll OtherCorporate and Intersegment EliminationsTotal Consolidated
Production of Natural Gas$113,975  $—  $—  $—  $—  $—  $113,975  
Production of Crude Oil38,823  —  —  —  —  —  38,823  
Natural Gas Processing731  —  —  —  —  —  731  
Natural Gas Gathering Services—  —  32,875  —  —  (32,875) —  
Natural Gas Transportation Service—  50,001  —  23,010  —  (17,672) 55,339  
Natural Gas Storage Service—  18,598  —  —  —  (8,060) 10,538  
Natural Gas Residential Sales—  —  —  96,146  —  —  96,146  
Natural Gas Commercial Sales—  —  —  12,107  —  —  12,107  
Natural Gas Industrial Sales—  —  —  1,032  —  —  1,032  
Natural Gas Marketing—  —  —  —  22,212  (681) 21,531  
Other152  368  —  161  859  (20) 1,520  
Total Revenues from Contracts with Customers153,681  68,967  32,875  132,456  23,071  (59,308) 351,742  
Alternative Revenue Programs—  —  —  465  —  —  465  
Derivative Financial Instruments5,194  —  —  —  (201) —  4,993  
Total Revenues$158,875  $68,967  $32,875  $132,921  $22,870  $(59,308) $357,200  
Nine Months Ended June 30, 2019 (Thousands)   
Revenues By Type of ServiceExploration and ProductionPipeline and StorageGatheringUtilityAll OtherCorporate and Intersegment EliminationsTotal Consolidated
Production of Natural Gas$371,710  $—  $—  $—  $—  $—  $371,710  
Production of Crude Oil111,256  —  —  —  —  —  111,256  
Natural Gas Processing2,676  —  —  —  —  —  2,676  
Natural Gas Gathering Services—  —  91,931  —  —  (91,931) —  
Natural Gas Transportation Service—  158,376  —  103,723  —  (54,556) 207,543  
Natural Gas Storage Service—  56,887  —  —  —  (24,367) 32,520  
Natural Gas Residential Sales—  —  —  492,267  —  —  492,267  
Natural Gas Commercial Sales—  —  —  68,408  —  —  68,408  
Natural Gas Industrial Sales—  —  —  4,400  —  —  4,400  
Natural Gas Marketing—  —  —  —  130,015  (1,056) 128,959  
Other1,028  3,112  2  (8,662) 2,185  (529) (2,864) 
Total Revenues from Contracts with Customers486,670  218,375  91,933  660,136  132,200  (172,439) 1,416,875  
Alternative Revenue Programs—  —  —  (1,528) —  —  (1,528) 
Derivative Financial Instruments(18,817) —  —  —  3,461  —  (15,356) 
Total Revenues$467,853  $218,375  $91,933  $658,608  $135,661  $(172,439) $1,399,991  
        The Company’s Pipeline and Storage segment expects to recognize the following revenue amounts in future periods related to “fixed” charges associated with remaining performance obligations for transportation and storage contracts: $47.0 million for the remainder of fiscal 2020; $175.3 million for fiscal 2021; $143.3 million for fiscal 2022; $98.2 million for fiscal 2023; $86.4 million for fiscal 2024; and $361.5 million thereafter.