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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 6 Months Ended
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Mar. 31, 2019
Accounting Policies [Abstract] |
Summary of Gas in Storage | The following table summarizes gas in storage, at average cost by segment as of:
| March 31, 2019 | September 30, 2018
($ in thousands) | Gas in Storage |  | Bcf | Gas in Storage |  | Bcf
Energy Services |  | $ | 34,819 |  | 12.1 |  |  | $ | 90,166 |  | 34.1 |
Natural Gas Distribution |  | 23,617 |  | 4.4 |  |  | 94,467 |  | 24.9 |
Total |  | $ | 58,436 |  | 16.5 |  |  | $ | 184,633 |  | 59.0 |
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) | September 30, 2018 |  | Assets reclassified as held for sale |  | Assets Sold |  | Other adjustments (1) |  | March 31, 2019
Assets held for sale: |  |  |  |  |  |  |  |  |
Nonutility plant and equipment - wind equipment, at cost | $ | 224,356 |  |  | $ | — |  |  | $ | (224,356 | ) |  | $ | — |  |  | $ | — |
Nonutility plant and equipment - accumulated depreciation, wind equipment | (18,501 | ) |  | — |  |  | 18,501 |  |  | — |  |  | — |
Prepaid and other current assets | 789 |  |  | 1,747 |  |  | (1,541 | ) |  | (995 | ) |  | — |
Other noncurrent assets | 261 |  |  | — |  |  | (261 | ) |  | — |  |  | — |
| $ | 206,905 |  |  | $ | 1,747 |  |  | $ | (207,657 | ) |  | $ | (995 | ) |  | $ | — |
Liabilities held for sale: |  |  |  |  |  |  |  |  |
Accounts payable and other | $ | 186 |  |  | $ | — |  |  | $ | (186 | ) |  | $ | — |  |  | $ | — |
Asset retirement obligation | 3,996 |  |  | — |  |  | (3,996 | ) |  | — |  |  | — |
| $ | 4,182 |  |  | $ | — |  |  | $ | (4,182 | ) |  | $ | — |  |  | $ | — |
(1) | Activity relates to amortization of prepaid and other current assets.
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table presents the changes in the components of accumulated other comprehensive income (loss), net of related tax effects during the three months ended March 31, 2019 and 2018:
(Thousands) | Investments in Equity Securities | Postemployment Benefit Obligation | Total
Balance at December 31, 2018 | $ | — |  |  | $ | (15,822 | ) |  | $ | (15,822 | )
Other comprehensive loss (income), net of tax |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax of $0, $(119), $(119) | — |  |  | 305 |  | (1) | 305 |
Balance at March 31, 2019 | $ | — |  |  | $ | (15,517 | ) |  | $ | (15,517 | )
Balance at December 31, 2017 | $ | 5,600 |  |  | $ | (14,060 | ) |  | $ | (8,460 | )
Other comprehensive (loss) income, net of tax |  |  |  |  |
Other comprehensive loss,before reclassifications, net of tax of $7,366, $0, $7,366 | (20,401 | ) |  | — |  |  | (20,401 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $(3,036), $(104), $(3,140) | 14,801 |  |  | 272 |  | (1) | 15,073 |
Net current-period other comprehensive (loss) income, net of tax of $4,330, $(104), $4,226 | (5,600 | ) |  | 272 |  |  | (5,328 | )
Balance as of March 31, 2018 | $ | — |  |  | $ | (13,788 | ) |  | $ | (13,788 | )
The following table presents the changes in the components of accumulated other comprehensive income (loss), net of related tax effects during the six months ended March 31, 2019 and 2018:
(Thousands) | Investments in Equity Securities | Postemployment Benefit Obligation | Total
Balance at September 30, 2018 | $ | 3,446 |  |  | $ | (16,056 | ) |  | $ | (12,610 | )
Other comprehensive income (loss), net of tax |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $0, $(215), $(215) | — |  |  | 539 |  | (1) | 539 |
Reclassification to retained earnings | (3,446 | ) | (2) | — |  |  | (3,446 | )
Balance at March 31, 2019 | $ | — |  |  | $ | (15,517 | ) |  | $ | (15,517 | )
Balance as of September 30, 2017 | $ | 11,044 |  |  | $ | (14,300 | ) |  | $ | (3,256 | )
Other comprehensive (loss) income, net of tax |  |  |  |  |
Other comprehensive loss, before reclassifications, net of tax of $8,217, $0, $8,217 | (22,691 | ) |  | — |  |  | (22,691 | )
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax of $(858), $(240), $(1,098) | 11,647 |  |  | 512 |  | (1) | 12,159 |
Net current-period other comprehensive (loss) income, net of tax of $7,359, $(240), $7,119 | (11,044 | ) |  | 512 |  |  | (10,532 | )
Balance as of March 31, 2018 | $ | — |  |  | $ | (13,788 | ) |  | $ | (13,788 | )
(1) | Included in the computation of net periodic pension cost, a component of operations and maintenance expense on the Unaudited Condensed Consolidated Statements of Operations.
(2) | Due to the adoption of ASU No. 2016-01, an amendment to ASC 825, Financial Instruments. See Note 2. Summary of Significant Accounting Policies - Recently Adopted Updates to the Accounting Standards Codification section for more details.
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | Accordingly, the following amounts on the Unaudited Condensed Consolidated Statement of Operations for the three and six months ended March 31, 2019, have been adjusted:
(Thousands) | As Previously Reported | Effect of Change | As Adjusted
Three Months Ended |  |  |
Statements of Operations |  |  |
Operation and maintenance | $ | 57,749 |  | $ | (952 | ) | $ | 56,797 |
Total operating expenses | $ | 841,251 |  | $ | (952 | ) | $ | 840,299 |
Operating income | $ | 177,792 |  | $ | 952 |  | $ | 178,744 |
Other income (expense), net | $ | 1,980 |  | $ | (952 | ) | $ | 1,028 |
Six Months Ended |  |  |
Statements of Operations |  |  |
Operation and maintenance | $ | 112,860 |  | $ | (1,903 | ) | $ | 110,957 |
Total operating expenses | $ | 1,471,311 |  | $ | (1,903 | ) | $ | 1,469,408 |
Operating income | $ | 253,037 |  | $ | 1,903 |  | $ | 254,940 |
Other income (expense), net | $ | 8,907 |  | $ | (1,903 | ) | $ | 7,004 |
Accordingly, the following table provides a reconciliation of cash and cash equivalents and restricted cash reported in the Unaudited Condensed Consolidated Balance Sheets to the total amounts in the Unaudited Condensed Consolidated Statements of Cash Flows as follows:
(Thousands) | March 31, 2019 | September 30, 2018 | March 31, 2018 | September 30, 2017
Balance Sheet |  |  |  |
Cash and cash equivalents | $ | 83,160 |  | $ | 1,458 |  | $ | 4,928 |  | $ | 2,226 |
Restricted cash in other noncurrent assets | 405 |  | 252 |  | 288 |  | 243 |
Statements of Cash Flow |  |  |  |
Cash, cash equivalents and restricted cash in the statement of cash flows | $ | 83,565 |  | $ | 1,710 |  | $ | 5,216 |  | $ | 2,469 |

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