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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]      
Revenue $ 1,742,659 $ 1,546,291 $ 1,693,332
Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 920,670 513,762  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition (83,973) 93,691  
Revenue 836,697 607,453  
Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 343,557 309,604  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Revenue 343,557 309,604  
Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 193,264 142,893  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Revenue 193,264 142,893  
Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 656,164 644,309  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 11,087 7,989  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Revenue 667,251 652,298  
Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 2,113,655 1,610,568  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 11,087 7,989  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition (83,973) 93,691  
Revenue 2,040,769 1,712,248  
All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 1,222 100,901  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition 0 (10,630)  
Revenue 1,222 90,271  
Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers (299,332) (256,228)  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition 0 0  
Revenue (299,332) (256,228)  
Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 1,815,545 1,455,241  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 11,087 7,989  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition (83,973) 83,061  
Revenue 1,742,659 1,546,291  
Production of Natural Gas [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 780,477 402,447  
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 780,477 402,447  
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 780,477 402,447  
Production of Crude Oil [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 135,191 107,844  
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 135,191 107,844  
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 135,191 107,844  
Natural Gas Processing [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 2,960 2,374  
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 2,960 2,374  
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 2,960 2,374  
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 193,264 142,893  
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 193,264 142,893  
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 (190,148) (142,821)  
Natural Gas Gathering Service [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 3,116 72  
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 255,849 229,391  
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 103,141 109,214  
Natural Gas Transportation Service [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 358,990 338,605  
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 (72,920) (77,699)  
Natural Gas Transportation Service [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 286,070 260,906  
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 83,080 79,073  
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 83,080 79,073  
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 (35,841) (34,579)  
Natural Gas Storage Service [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 47,239 44,494  
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 492,567 475,846  
Natural Gas Residential Sales [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 492,567 475,846  
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 492,567 475,846  
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 62,634 61,239  
Natural Gas Commercial Sales [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 62,634 61,239  
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 62,634 61,239  
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 3,071 3,291  
Natural Gas Industrial Sales [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 3,071 3,291  
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 3,071 3,291  
Natural Gas Marketing [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Marketing [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Marketing [Member] | Gathering [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Marketing [Member] | Utility [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Marketing [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 0 0  
Natural Gas Marketing [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 678 95,727  
Natural Gas Marketing [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers (49) (835)  
Natural Gas Marketing [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 629 94,892  
Other [Member] | Exploration And Production [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 2,042 1,097  
Other [Member] | Pipeline And Storage [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 4,628 1,140  
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 (5,249) (5,281)  
Other [Member] | Total Reportable Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 1,421 (3,044)  
Other [Member] | All Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers 544 5,174  
Other [Member] | Corporate And Intersegment Eliminations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers (374) (294)  
Other [Member] | Total Consolidated [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contracts with Customers $ 1,591 $ 1,836