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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Energy Services    
Derivative assets:    
Amounts Presented in Balance Sheets $ 51,349 $ 39,094
Offsetting Derivative Instruments (32,601) (16,294)
Financial Collateral Received/Pledged (5,527) (200)
Net Amounts 13,221 22,600
Derivative liabilities:    
Amounts Presented in Balance Sheets 106,482 48,186
Offsetting Derivative Instruments (32,601) (16,294)
Financial Collateral Received/Pledged (38,231) (8,766)
Net Amounts 35,650 23,126
Energy Services | Physical commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 16,048 21,715
Offsetting Derivative Instruments (3,137) (2,173)
Financial Collateral Received/Pledged (200) (200)
Net Amounts 12,711 19,342
Derivative liabilities:    
Amounts Presented in Balance Sheets 38,787 25,299
Offsetting Derivative Instruments (3,137) (2,173)
Financial Collateral Received/Pledged 0 0
Net Amounts 35,650 23,126
Energy Services | Financial commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 35,265 17,335
Offsetting Derivative Instruments (29,434) (14,121)
Financial Collateral Received/Pledged (5,327) 0
Net Amounts 504 3,214
Derivative liabilities:    
Amounts Presented in Balance Sheets 67,665 22,887
Offsetting Derivative Instruments (29,434) (14,121)
Financial Collateral Received/Pledged (38,231) (8,766)
Net Amounts 0 0
Energy Services | Foreign currency contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 36 44
Offsetting Derivative Instruments (30) 0
Financial Collateral Received/Pledged 0 0
Net Amounts 6 44
Derivative liabilities:    
Amounts Presented in Balance Sheets 30  
Offsetting Derivative Instruments (30)  
Financial Collateral Received/Pledged 0  
Net Amounts 0  
Natural Gas Distribution    
Derivative assets:    
Amounts Presented in Balance Sheets 487 151
Offsetting Derivative Instruments (25) (20)
Financial Collateral Received/Pledged 0 0
Net Amounts 462 131
Derivative liabilities:    
Amounts Presented in Balance Sheets 16,065 9,688
Offsetting Derivative Instruments (25) (20)
Financial Collateral Received/Pledged (3,478) (1,149)
Net Amounts 12,562 8,519
Natural Gas Distribution | Physical commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 487 151
Offsetting Derivative Instruments (25) (20)
Financial Collateral Received/Pledged 0 0
Net Amounts 462 131
Derivative liabilities:    
Amounts Presented in Balance Sheets 53 72
Offsetting Derivative Instruments (25) (20)
Financial Collateral Received/Pledged 0 0
Net Amounts 28 52
Natural Gas Distribution | Financial commodity contracts    
Derivative liabilities:    
Amounts Presented in Balance Sheets 3,478 1,149
Offsetting Derivative Instruments 0 0
Financial Collateral Received/Pledged (3,478) (1,149)
Net Amounts 0 0
Natural Gas Distribution | Interest rate contracts    
Derivative liabilities:    
Amounts Presented in Balance Sheets 12,534 8,467
Offsetting Derivative Instruments 0 0
Financial Collateral Received/Pledged 0 0
Net Amounts $ 12,534 $ 8,467