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COMMITMENTS AND CONTINGENT LIABILITIES - SCHEDULE OF FUTURE COMMITTED EXPENSES (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2018
Sep. 30, 2017
Long-term Purchase Commitment [Line Items]    
Regulatory assets $ 348,079 $ 375,919
Current charges recoverable through BGSS 27,100  
Natural Gas Purchases and Future Demand Fees, Next Five Fiscal Years    
2018 257,557  
2019 437,684  
2020 259,354  
2021 193,496  
2022 171,898  
Thereafter 788,025  
Energy Services    
Natural Gas Purchases and Future Demand Fees, Next Five Fiscal Years    
2018 202,811  
2019 269,093  
2020 88,711  
2021 51,932  
2022 32,698  
Thereafter 29,129  
Energy Services | Natural gas purchases    
Natural Gas Purchases and Future Demand Fees, Next Five Fiscal Years    
2018 170,111  
2019 187,185  
2020 20,893  
2021 10,681  
2022 0  
Thereafter 0  
Energy Services | Storage demand fees    
Natural Gas Purchases and Future Demand Fees, Next Five Fiscal Years    
2018 9,445  
2019 31,234  
2020 19,636  
2021 13,192  
2022 8,551  
Thereafter 4,991  
Energy Services | Pipeline demand fees    
Natural Gas Purchases and Future Demand Fees, Next Five Fiscal Years    
2018 23,255  
2019 50,674  
2020 48,182  
2021 28,059  
2022 24,147  
Thereafter $ 24,138  
Energy Services | Minimum    
Long-term Purchase Commitment [Line Items]    
Storage and pipeline capacity, contract term 1 year  
Energy Services | Maximum    
Long-term Purchase Commitment [Line Items]    
Storage and pipeline capacity, contract term 10 years  
Natural Gas Distribution    
Natural Gas Purchases and Future Demand Fees, Next Five Fiscal Years    
2018 $ 54,746  
2019 168,591  
2020 170,643  
2021 141,564  
2022 139,200  
Thereafter 758,896  
Natural Gas Distribution | Natural gas purchases    
Natural Gas Purchases and Future Demand Fees, Next Five Fiscal Years    
2018 27,630  
2019 56,627  
2020 38,479  
2021 34,411  
2022 34,740  
Thereafter 72,995  
Natural Gas Distribution | Storage demand fees    
Natural Gas Purchases and Future Demand Fees, Next Five Fiscal Years    
2018 7,741  
2019 31,362  
2020 24,245  
2021 14,243  
2022 12,922  
Thereafter 13,920  
Natural Gas Distribution | Pipeline demand fees    
Natural Gas Purchases and Future Demand Fees, Next Five Fiscal Years    
2018 19,375  
2019 80,602  
2020 107,919  
2021 92,910  
2022 91,538  
Thereafter 671,981  
Expended, net of recoveries    
Long-term Purchase Commitment [Line Items]    
Regulatory assets $ 29,647 $ 28,547