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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Financial commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets $ 323  
Offsetting Derivative Instruments (117)  
Financial Collateral Received/Pledged 0  
Net Amounts 206  
Energy Services    
Derivative assets:    
Amounts Presented in Balance Sheets 34,373 $ 39,094
Offsetting Derivative Instruments (20,261) (16,294)
Financial Collateral Received/Pledged 160 (200)
Net Amounts 14,272 22,600
Derivative liabilities:    
Amounts Presented in Balance Sheets 64,599 48,186
Offsetting Derivative Instruments (20,261) (16,294)
Financial Collateral Received/Pledged (16,154) (8,766)
Net Amounts 28,184 23,126
Energy Services | Physical commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 9,321 21,715
Offsetting Derivative Instruments (3,461) (2,173)
Financial Collateral Received/Pledged (200) (200)
Net Amounts 5,660 19,342
Derivative liabilities:    
Amounts Presented in Balance Sheets 30,927 25,299
Offsetting Derivative Instruments (3,461) (2,173)
Financial Collateral Received/Pledged 0 0
Net Amounts 27,466 23,126
Energy Services | Financial commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 25,052 17,335
Offsetting Derivative Instruments (16,800) (14,121)
Financial Collateral Received/Pledged 360 0
Net Amounts 8,612 3,214
Derivative liabilities:    
Amounts Presented in Balance Sheets 33,314 22,887
Offsetting Derivative Instruments (16,800) (14,121)
Financial Collateral Received/Pledged (16,154) (8,766)
Net Amounts 360 0
Energy Services | Foreign currency contracts    
Derivative assets:    
Amounts Presented in Balance Sheets   44
Offsetting Derivative Instruments   0
Financial Collateral Received/Pledged   0
Net Amounts   44
Derivative liabilities:    
Amounts Presented in Balance Sheets 358  
Offsetting Derivative Instruments 0  
Financial Collateral Received/Pledged 0  
Net Amounts 358  
Natural Gas Distribution    
Derivative assets:    
Amounts Presented in Balance Sheets 380 151
Offsetting Derivative Instruments (123) (20)
Financial Collateral Received/Pledged 0 0
Net Amounts 257 131
Derivative liabilities:    
Amounts Presented in Balance Sheets 403 9,688
Offsetting Derivative Instruments (123) (20)
Financial Collateral Received/Pledged 206 (1,149)
Net Amounts 486 8,519
Natural Gas Distribution | Physical commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 57 151
Offsetting Derivative Instruments (6) (20)
Financial Collateral Received/Pledged 0 0
Net Amounts 51 131
Derivative liabilities:    
Amounts Presented in Balance Sheets 286 72
Offsetting Derivative Instruments (6) (20)
Financial Collateral Received/Pledged 0 0
Net Amounts 280 52
Natural Gas Distribution | Financial commodity contracts    
Derivative liabilities:    
Amounts Presented in Balance Sheets 117 1,149
Offsetting Derivative Instruments (117) 0
Financial Collateral Received/Pledged 206 (1,149)
Net Amounts 206 0
Natural Gas Distribution | Interest rate contracts    
Derivative liabilities:    
Amounts Presented in Balance Sheets   8,467
Offsetting Derivative Instruments   0
Financial Collateral Received/Pledged   0
Net Amounts   $ 8,467
Home Services and Other    
Derivative assets:    
Amounts Presented in Balance Sheets 325  
Offsetting Derivative Instruments 0  
Financial Collateral Received/Pledged 0  
Net Amounts 325  
Derivative liabilities:    
Amounts Presented in Balance Sheets 0  
Offsetting Derivative Instruments 0  
Financial Collateral Received/Pledged 0  
Net Amounts 0  
Home Services and Other | Physical commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 325  
Offsetting Derivative Instruments 0  
Financial Collateral Received/Pledged 0  
Net Amounts 325  
Home Services and Other | Interest rate contracts    
Derivative liabilities:    
Amounts Presented in Balance Sheets 0  
Offsetting Derivative Instruments 0  
Financial Collateral Received/Pledged 0  
Net Amounts $ 0