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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]      
Revenue $ 2,186,046 $ 1,742,659 $ 1,546,291
Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 1,893,058 920,670  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Derivative Financial Instruments $ (882,594) $ (83,973)  
Derivative Financial Instruments, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue Revenue  
Revenue $ 1,010,464 $ 836,697  
Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 377,044 343,557  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Derivative Financial Instruments $ 0 $ 0  
Derivative Financial Instruments, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue Revenue  
Revenue $ 377,044 $ 343,557  
Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 214,843 193,264  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Derivative Financial Instruments $ 0 $ 0  
Derivative Financial Instruments, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue Revenue  
Revenue $ 214,843 $ 193,264  
Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 890,864 656,164  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 7,357 11,087  
Derivative Financial Instruments $ 0 $ 0  
Derivative Financial Instruments, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue Revenue  
Revenue $ 898,221 $ 667,251  
Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 3,375,809 2,113,655  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 7,357 11,087  
Derivative Financial Instruments $ (882,594) $ (83,973)  
Derivative Financial Instruments, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue Revenue  
Revenue $ 2,500,572 $ 2,040,769  
All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 6 1,222  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Derivative Financial Instruments $ 0 $ 0  
Derivative Financial Instruments, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue Revenue  
Revenue $ 6 $ 1,222  
Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers (314,532) (299,332)  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Derivative Financial Instruments $ 0 $ 0  
Derivative Financial Instruments, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue Revenue  
Revenue $ (314,532) $ (299,332)  
Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 3,061,283 1,815,545  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 7,357 11,087  
Derivative Financial Instruments $ (882,594) $ (83,973)  
Derivative Financial Instruments, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue Revenue  
Revenue $ 2,186,046 $ 1,742,659  
Production of Natural Gas [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 1,730,723 780,477  
Production of Natural Gas [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Production of Natural Gas [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Production of Natural Gas [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Production of Natural Gas [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 1,730,723 780,477  
Production of Natural Gas [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Production of Natural Gas [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Production of Natural Gas [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 1,730,723 780,477  
Production of Crude Oil [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 150,957 135,191  
Production of Crude Oil [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Production of Crude Oil [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Production of Crude Oil [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Production of Crude Oil [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 150,957 135,191  
Production of Crude Oil [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Production of Crude Oil [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Production of Crude Oil [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 150,957 135,191  
Natural Gas Processing [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 3,511 2,960  
Natural Gas Processing [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Processing [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Processing [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Processing [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 3,511 2,960  
Natural Gas Processing [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Processing [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Processing [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 3,511 2,960  
Natural Gas Gathering Service [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Gathering Service [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Gathering Service [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 214,843 193,264  
Natural Gas Gathering Service [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Gathering Service [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 214,843 193,264  
Natural Gas Gathering Service [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Gathering Service [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers (202,757) (190,148)  
Natural Gas Gathering Service [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 12,086 3,116  
Natural Gas Transportation Service [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Transportation Service [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 289,967 255,849  
Natural Gas Transportation Service [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Transportation Service [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 106,495 103,141  
Natural Gas Transportation Service [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 396,462 358,990  
Natural Gas Transportation Service [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Transportation Service [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers (74,749) (72,920)  
Natural Gas Transportation Service [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 321,713 286,070  
Natural Gas Storage Service [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Storage Service [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 84,565 83,080  
Natural Gas Storage Service [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Storage Service [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Storage Service [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 84,565 83,080  
Natural Gas Storage Service [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Storage Service [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers (36,382) (35,841)  
Natural Gas Storage Service [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 48,183 47,239  
Natural Gas Residential Sales [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Residential Sales [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Residential Sales [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Residential Sales [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 688,271 492,567  
Natural Gas Residential Sales [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 688,271 492,567  
Natural Gas Residential Sales [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Residential Sales [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Residential Sales [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 688,271 492,567  
Natural Gas Commercial Sales [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Commercial Sales [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Commercial Sales [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Commercial Sales [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 95,114 62,634  
Natural Gas Commercial Sales [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 95,114 62,634  
Natural Gas Commercial Sales [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Commercial Sales [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Commercial Sales [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 95,114 62,634  
Natural Gas Industrial Sales [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Industrial Sales [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Industrial Sales [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Industrial Sales [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 4,902 3,071  
Natural Gas Industrial Sales [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 4,902 3,071  
Natural Gas Industrial Sales [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Industrial Sales [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Industrial Sales [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 4,902 3,071  
Natural Gas Marketing [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers   0  
Natural Gas Marketing [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers   0  
Natural Gas Marketing [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers   0  
Natural Gas Marketing [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers   0  
Natural Gas Marketing [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers   0  
Natural Gas Marketing [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers   678  
Natural Gas Marketing [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers   (49)  
Natural Gas Marketing [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers   629  
Other [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 7,867 2,042  
Other [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 2,512 4,628  
Other [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Other [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers (3,918) (5,249)  
Other [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 6,461 1,421  
Other [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 6 544  
Other [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers (644) (374)  
Other [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers $ 5,823 $ 1,591