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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

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