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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense | $ 844 | $ (57,688) |  |
Total assets | 3,977,388 | 3,977,388 |  | $ 3,928,507
Assets held for sale | 206,898 | 206,898 |  | 0
Clean Energy Ventures |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense | (671) | (63,773) |  |
Energy Services |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense | 1,598 | 9,249 |  |
Midstream |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense | (142) | (13,946) |  |
Operating Segments |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets | 3,986,600 | 3,986,600 |  | 3,922,001
Operating Segments | Natural Gas Distribution |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets | 2,558,895 | 2,558,895 |  | 2,519,578
Operating Segments | Clean Energy Ventures |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets | 796,380 | 796,380 |  | 771,340
Operating Segments | Energy Services |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets | 375,548 | 375,548 |  | 398,277
Operating Segments | Midstream |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets | 255,777 | 255,777 |  | 232,806
Home Services and Other |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense | 59 | 10,782 |  |
Total assets | 143,469 | 143,469 |  | 114,801
Intercompany Assets |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Total assets | (152,681) | (152,681) |  | $ (108,295)
Wind Assets And Related Liabilities [Member] | Clean Energy Ventures |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets held for sale | $ 206,898 | $ 206,898 | $ 224,898 |

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