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Segment Information - Revenue from External Customers by Products and Services (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues $ 2,821,137 $ 2,901,848 $ 3,115,546
Distribution      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Other gas revenues 23,129 41,704 8,999
Total distribution revenues 2,624,251 2,742,824 3,000,404
Distribution | Natural Gas, US Regulated      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 2,503,681 2,605,491 2,892,155
Distribution | Natural Gas, Gathering, Transportation, Marketing and Processing      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 97,441 95,629 99,250
Distribution | Residential | Natural Gas, US Regulated      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 1,717,070 1,733,548 1,916,101
Distribution | Commercial | Natural Gas, US Regulated      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 654,963 711,284 797,073
Distribution | Industrial | Natural Gas, US Regulated      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 89,641 118,046 131,267
Distribution | Public authority and other | Natural Gas, US Regulated      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 42,007 42,613 47,714
Pipeline and Storage      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Pipeline and storage revenues $ 196,886 $ 159,024 $ 115,142