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REVENUE Disaggregated Revenue - Type (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 224,149 |
Revenues out of scope | 587,618 |
Total operating revenues | 811,767 | $ 705,305
Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 147,539 |
Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 56,045 |
Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 18,934 |
Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 1,631 |
Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 802,129 | $ 701,764
Home Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 12,500 |
Unregulated | Home Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,945 |
Revenues out of scope | 0 |
Total operating revenues | 11,945 |
Unregulated | Home Services and Other | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,717 |
Unregulated | Home Services and Other | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 228 |
Unregulated | Home Services and Other | Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Unregulated | Home Services and Other | Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Natural Gas Distribution | Regulated | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 194,983 |
Revenues out of scope | 4,982 |
Total operating revenues | 199,965 |
Natural Gas Distribution | Regulated | Operating Segments | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 133,690 |
Natural Gas Distribution | Regulated | Operating Segments | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 40,728 |
Natural Gas Distribution | Regulated | Operating Segments | Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 18,934 |
Natural Gas Distribution | Regulated | Operating Segments | Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 1,631 |
Clean Energy Ventures | Unregulated | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 7,141 |
Revenues out of scope | 7,756 |
Total operating revenues | 14,897 |
Clean Energy Ventures | Unregulated | Operating Segments | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 2,132 |
Clean Energy Ventures | Unregulated | Operating Segments | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 5,009 |
Clean Energy Ventures | Unregulated | Operating Segments | Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Clean Energy Ventures | Unregulated | Operating Segments | Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Energy Services | Unregulated | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 10,080 |
Revenues out of scope | 574,880 |
Total operating revenues | 584,960 |
Energy Services | Unregulated | Operating Segments | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Energy Services | Unregulated | Operating Segments | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 10,080 |
Energy Services | Unregulated | Operating Segments | Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Energy Services | Unregulated | Operating Segments | Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 0 |

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