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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
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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.

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