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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 5,408,618 | $ 5,316,477
Operating Segments |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 5,539,543 | 5,435,389
Operating Segments | Natural Gas Distribution |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 3,617,354 | 3,531,477
Operating Segments | Clean Energy Ventures |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 851,755 | 814,277
Operating Segments | Energy Services |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 273,460 | 244,836
Operating Segments | Storage and Transportation |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 796,974 | 844,799
Home Services and Other |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 125,243 | 138,375
Intercompany Assets |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ (256,168) | $ (257,287)

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