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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 3,960,740 | $ 3,928,507
Assets held for sale | 224,898 | 0
Operating Segments |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 3,973,559 | 3,922,001
Operating Segments | Natural Gas Distribution |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 2,567,347 | 2,519,578
Operating Segments | Clean Energy Ventures |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 812,789 | 771,340
Operating Segments | Energy Services |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 366,322 | 398,277
Operating Segments | Midstream |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 227,101 | 232,806
Home Services and Other |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 107,415 | 114,801
Intercompany Assets |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ (120,234) | $ (108,295)

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