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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 9 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Summary of Gas in Storage | The following table summarizes gas in storage, at average cost by segment as of:
| June 30, 2018 | September 30, 2017
($ in thousands) | Gas in Storage |  | Bcf | Gas in Storage |  | Bcf
Energy Services |  | $ | 86,889 |  | 34.7 |  |  | $ | 122,884 |  | 53.9 |
Natural Gas Distribution |  | 49,395 |  | 13.8 |  |  | 79,179 |  | 21.8 |
Total |  | $ | 136,284 |  | 48.5 |  |  | $ | 202,063 |  | 75.7 |
Accounts Receivable by Subsidiary | Customer accounts receivable include outstanding billings from the following subsidiaries as of:
(Thousands) | June 30, 2018 |  | September 30, 2017
Energy Services | $ | 145,373 |  | 72 | % |  | $ | 150,322 |  | 77 | %
Natural Gas Distribution (1) | 48,495 |  | 24 |  |  | 37,432 |  | 19 |
Clean Energy Ventures | 3,163 |  | 2 |  |  | 2,655 |  | 1 |
Home Services and Other Operations | 4,073 |  | 2 |  |  | 6,058 |  | 3 |
Total | $ | 201,104 |  | 100 | % |  | $ | 196,467 |  | 100 | %
(1) | Does not include unbilled revenues of $7.1 million and $7.2 million as of June 30, 2018 and September 30, 2017, respectively.
Disposal Groups, Including Discontinued Operations | The major classes of assets and liabilities included within the disposal group as held for sale are as follows:
(Thousands) | March 31, 2018 |  | Assets Sold |  | Other Adjustments |  | June 30, 2018
Assets held for sale: |  |  |  |  |  |  |
Property, plant and equipment - wind equipment, at cost | $ | 244,972 |  |  | $ | (20,688 | ) |  | $ | — |  |  | $ | 224,284 |
Property, plant and equipment - accumulated depreciation, wind equipment | (21,561 | ) |  | 3,060 |  |  | — |  |  | (18,501 | )
Prepaid and accrued taxes | 1,226 |  |  | (77 | ) |  | (295 | ) |  | 854 |
Other noncurrent assets | 261 |  |  | — |  |  | — |  |  | 261 |
| $ | 224,898 |  |  | $ | (17,705 | ) |  | $ | (295 | ) |  | $ | 206,898 |
Liabilities held for sale: |  |  |  |  |  |  |
Accounts payable and other | $ | — |  |  | $ | 186 |  |  | $ | — |  |  | $ | 186 |
Asset retirement obligation | 4,262 |  |  | (266 | ) |  | — |  |  | 3,996 |
| $ | 4,262 |  |  | $ | (80 | ) |  | $ | — |  |  | $ | 4,182 |

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