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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenue $ 357,200 $ 342,912 $ 1,399,991 $ 1,303,473
Exploration And Production [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 153,681   486,670  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0   0  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition 5,194   (18,817)  
Revenue 158,875   467,853  
Pipeline And Storage [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 68,967   218,375  
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 68,967   218,375  
Gathering [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 32,875   91,933  
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 32,875   91,933  
Utility [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 132,456   660,136  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 465   (1,528)  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition 0   0  
Revenue 132,921   658,608  
Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 22,217   130,030  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 0   0  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition (201)   3,461  
Revenue 22,016   133,491  
All Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 854   2,170  
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 854   2,170  
Corporate And Intersegment Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers (59,308)   (172,439)  
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 (59,308)   (172,439)  
Total Consolidated [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 351,742   1,416,875  
Alternative Revenue Programs Outside Scope of Authoritative Guidance on Revenue Recognition 465   (1,528)  
Derivative Financial Instruments Outside Scope of Authoritative Guidance on Revenue Recognition 4,993   (15,356)  
Revenue 357,200   1,399,991  
Production of Natural Gas [Member] | Exploration And Production [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 113,975   371,710  
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] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
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 113,975   371,710  
Production of Crude Oil [Member] | Exploration And Production [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 38,823   111,256  
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] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
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 38,823   111,256  
Natural Gas Processing [Member] | Exploration And Production [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 731   2,676  
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] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
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 731   2,676  
Natural Gas Gathering Services [Member] | Exploration And Production [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
Natural Gas Gathering Services [Member] | Pipeline And Storage [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
Natural Gas Gathering Services [Member] | Gathering [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 32,875   91,931  
Natural Gas Gathering Services [Member] | Utility [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
Natural Gas Gathering Services [Member] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
Natural Gas Gathering Services [Member] | All Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
Natural Gas Gathering Services [Member] | Corporate And Intersegment Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers (32,875)   (91,931)  
Natural Gas Gathering Services [Member] | Total Consolidated [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
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 50,001   158,376  
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 23,010   103,723  
Natural Gas Transportation Service [Member] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
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 (17,672)   (54,556)  
Natural Gas Transportation Service [Member] | Total Consolidated [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 55,339   207,543  
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 18,598   56,887  
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] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
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 (8,060)   (24,367)  
Natural Gas Storage Service [Member] | Total Consolidated [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 10,538   32,520  
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 96,146   492,267  
Natural Gas Residential Sales [Member] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
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 96,146   492,267  
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 12,107   68,408  
Natural Gas Commercial Sales [Member] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
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 12,107   68,408  
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 1,032   4,400  
Natural Gas Industrial Sales [Member] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
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 1,032   4,400  
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] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 22,212   130,015  
Natural Gas Marketing [Member] | All Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   0  
Natural Gas Marketing [Member] | Corporate And Intersegment Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers (681)   (1,056)  
Natural Gas Marketing [Member] | Total Consolidated [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 21,531   128,959  
Other [Member] | Exploration And Production [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 152   1,028  
Other [Member] | Pipeline And Storage [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 368   3,112  
Other [Member] | Gathering [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 0   2  
Other [Member] | Utility [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 161   (8,662)  
Other [Member] | Energy Marketing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 5   15  
Other [Member] | All Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 854   2,170  
Other [Member] | Corporate And Intersegment Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers (20)   (529)  
Other [Member] | Total Consolidated [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers $ 1,520   $ (2,864)