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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Energy Services    
Derivative assets:    
Amounts Presented in Balance Sheets [1] $ 56,120 $ 37,396
Offsetting Derivative Instruments [2] (39,465) (22,719)
Financial Collateral Received/Pledged [3] 3,381 (200)
Net Amounts [4] 20,036 14,477
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 99,279 69,442
Offsetting Derivative Instruments [2] (39,464) (22,719)
Financial Collateral Received/Pledged [3] (16,288) (20,949)
Net Amounts [4] 43,527 25,774
Energy Services | Physical commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets [1] 11,881 11,597
Offsetting Derivative Instruments [2] (3,916) (3,944)
Financial Collateral Received/Pledged [3] (200) (200)
Net Amounts [4] 7,765 7,453
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 46,923 29,474
Offsetting Derivative Instruments [2] (3,915) (3,944)
Financial Collateral Received/Pledged [3] 0 0
Net Amounts [4] 43,008 25,530
Energy Services | Financial commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets [1] 44,239 25,799
Offsetting Derivative Instruments [2] (35,549) (18,775)
Financial Collateral Received/Pledged [3] 3,581 0
Net Amounts [4] 12,271 7,024
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 51,837 39,724
Offsetting Derivative Instruments [2] (35,549) (18,775)
Financial Collateral Received/Pledged [3] (16,288) (20,949)
Net Amounts [4] 0 0
Energy Services | Foreign currency contracts    
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 519 244
Offsetting Derivative Instruments [2] 0 0
Financial Collateral Received/Pledged [3] 0 0
Net Amounts [4] 519 244
Natural Gas Distribution    
Derivative assets:    
Amounts Presented in Balance Sheets 5,084 [1] 179
Offsetting Derivative Instruments (2,335) [2] (3)
Financial Collateral Received/Pledged (1,194) [3] (94)
Net Amounts 1,555 [4] 82
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 2,660 192
Offsetting Derivative Instruments [2] (2,335) (3)
Financial Collateral Received/Pledged [3] 0 0
Net Amounts [4] 325 189
Natural Gas Distribution | Physical commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 1,555 [1] 85
Offsetting Derivative Instruments 0 [2] (3)
Financial Collateral Received/Pledged 0 [3] 0
Net Amounts 1,555 [4] 82
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 325 192
Offsetting Derivative Instruments [2] 0 (3)
Financial Collateral Received/Pledged [3] 0 0
Net Amounts [4] 325 189
Natural Gas Distribution | Financial commodity contracts    
Derivative assets:    
Amounts Presented in Balance Sheets 3,529 [1] 94
Offsetting Derivative Instruments (2,335) [2] 0
Financial Collateral Received/Pledged (1,194) [3] (94)
Net Amounts 0 [4] 0
Derivative liabilities:    
Amounts Presented in Balance Sheets [1] 2,335  
Offsetting Derivative Instruments [2] (2,335)  
Financial Collateral Received/Pledged [3] 0  
Net Amounts [4] 0  
Home Services and Other    
Derivative assets:    
Amounts Presented in Balance Sheets [1] 239 381
Offsetting Derivative Instruments [2] 0 0
Financial Collateral Received/Pledged [3] 0 0
Net Amounts [4] 239 381
Home Services and Other | Interest rate contracts    
Derivative assets:    
Amounts Presented in Balance Sheets [1] 239 381
Offsetting Derivative Instruments [2] 0 0
Financial Collateral Received/Pledged [3] 0 0
Net Amounts [4] $ 239 $ 381
[1] Derivative assets and liabilities are presented on a gross basis on the balance sheet as the Company does not elect balance sheet offsetting under ASC 210-20.
[2] Includes transactions with NAESB netting election, transactions held by FCMs with net margining and transactions with ISDA netting.
[3] Financial collateral includes cash balances at FCMs as well as cash received from or pledged to other counterparties.
[4] Net amounts represent presentation of derivative assets and liabilities if the Company were to elect balance sheet offsetting under ASC 210-20.