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REVENUE Disaggregated Revenue - Product (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 |
Alternative revenue programs |  | (867) |
Derivative Instruments |  | 590,792 |
Revenues out of scope |  | 587,618 |
Total operating revenues |  | 811,767 | $ 705,305
Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 194,983 |
Wholesale natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 10,080 |
Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 7,796 |
Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 4,694 |
Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 7,141 |
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 |
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | [1] | (545) |
Revenues out of scope | [1] | (2,307) |
Regulated | Operating Segments | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 194,983 |
Alternative revenue programs |  | (867) |
Derivative Instruments |  | 5,849 |
Revenues out of scope |  | 4,982 |
Total operating revenues |  | 199,965 |
Regulated | Operating Segments | Natural gas utility sales | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 194,983 |
Regulated | Operating Segments | Wholesale natural gas services | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Regulated | Operating Segments | Service contracts | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Regulated | Operating Segments | Installations and maintenance | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Regulated | Operating Segments | Electricity sales | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Regulated | Eliminations | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues out of scope | [1] | 0 |
Unregulated | Operating Segments | Clean Energy Ventures |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 7,141 |
Alternative revenue programs |  | 0 |
Derivative Instruments |  | 7,756 |
Revenues out of scope |  | 7,756 |
Total operating revenues |  | 14,897 |
Unregulated | Operating Segments | Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 10,080 |
Alternative revenue programs |  | 0 |
Derivative Instruments |  | 577,187 |
Revenues out of scope |  | 574,880 |
Total operating revenues |  | 584,960 |
Unregulated | Operating Segments | Natural gas utility sales | Clean Energy Ventures |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Operating Segments | Natural gas utility sales | Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Operating Segments | Wholesale natural gas services | Clean Energy Ventures |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Operating Segments | Wholesale natural gas services | Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 10,080 |
Unregulated | Operating Segments | Service contracts | Clean Energy Ventures |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Operating Segments | Service contracts | Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Operating Segments | Installations and maintenance | Clean Energy Ventures |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Operating Segments | Installations and maintenance | Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Operating Segments | Electricity sales | Clean Energy Ventures |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 7,141 |
Unregulated | Operating Segments | Electricity sales | Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Home Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 11,945 |
Alternative revenue programs |  | 0 |
Derivative Instruments |  | 0 |
Revenues out of scope |  | 0 |
Total operating revenues |  | 11,945 |
Unregulated | Home Services and Other | Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Home Services and Other | Wholesale natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Home Services and Other | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 7,796 |
Unregulated | Home Services and Other | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 4,694 |
Unregulated | Home Services and Other | Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers |  | 0 |
Unregulated | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | [1] | (545) |
Revenues out of scope | [1] | 0 |
Unregulated | Eliminations | Clean Energy Ventures |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues out of scope | [1] | 0 |
Unregulated | Eliminations | Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues out of scope | [1] | $ (2,307) |
[1] | Consists of transactions between subsidiaries that are eliminated in consolidation.

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