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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | $ 317,155 |  |  | $ 541,304 |
Alternative revenue programs |  | 7,901 |  |  | 7,034 |
Derivative Instruments |  | 547,230 |  |  | 1,138,022 |
Revenues out of scope |  | 549,100 |  |  | 1,136,718 |
Total operating revenues |  | 866,255 |  | $ 1,019,043 | 1,678,022 | $ 1,724,348
Natural gas utility sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 288,168 |  |  | 483,151 |
Wholesale natural gas services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 12,248 |  |  | 22,328 |
Service contracts |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 7,847 |  |  | 15,643 |
Installations and maintenance |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 4,486 |  |  | 9,180 |
Electricity sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 5,058 |  |  | 12,199 |
Operating Segments |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total operating revenues |  | 860,605 |  | $ 1,055,243 | 1,662,734 | $ 1,757,007
Home Services and Other |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  |  | $ 12,300 |  | 24,800 |
Eliminations |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers | [1] | (652) |  |  | (1,197) |
Revenues out of scope | [1] | (6,031) |  |  | (8,338) |
Regulated | Operating Segments | Natural Gas Distribution |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 288,168 |  |  | 483,151 |
Alternative revenue programs |  | 7,901 |  |  | 7,034 |
Derivative Instruments |  | 5,351 |  |  | 11,200 |
Revenues out of scope |  | 13,252 |  |  | 18,234 |
Total operating revenues |  | 301,420 |  |  | 501,385 |
Regulated | Operating Segments | Natural gas utility sales | Natural Gas Distribution |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 288,168 |  |  | 483,151 |
Regulated | Operating Segments | Wholesale natural gas services | Natural Gas Distribution |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Regulated | Operating Segments | Service contracts | Natural Gas Distribution |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Regulated | Operating Segments | Installations and maintenance | Natural Gas Distribution |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Regulated | Operating Segments | Electricity sales | Natural Gas Distribution |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Regulated | Eliminations | Natural Gas Distribution |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues out of scope | [1] | 0 |  |  | 0 |
Unregulated | Operating Segments | Clean Energy Ventures |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 5,058 |  |  | 12,199 |
Alternative revenue programs |  | 0 |  |  | 0 |
Derivative Instruments |  | 6,302 |  |  | 14,058 |
Revenues out of scope |  | 6,302 |  |  | 14,058 |
Total operating revenues |  | 11,360 |  |  | 26,257 |
Unregulated | Operating Segments | Energy Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 12,248 |  |  | 22,328 |
Alternative revenue programs |  | 0 |  |  | 0 |
Derivative Instruments |  | 535,577 |  |  | 1,112,764 |
Revenues out of scope |  | 529,546 |  |  | 1,104,426 |
Total operating revenues |  | 541,794 |  |  | 1,126,754 |
Unregulated | Operating Segments | Natural gas utility sales | Clean Energy Ventures |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Operating Segments | Natural gas utility sales | Energy Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Operating Segments | Wholesale natural gas services | Clean Energy Ventures |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Operating Segments | Wholesale natural gas services | Energy Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 12,248 |  |  | 22,328 |
Unregulated | Operating Segments | Service contracts | Clean Energy Ventures |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Operating Segments | Service contracts | Energy Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Operating Segments | Installations and maintenance | Clean Energy Ventures |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Operating Segments | Installations and maintenance | Energy Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Operating Segments | Electricity sales | Clean Energy Ventures |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 5,058 |  |  | 12,199 |
Unregulated | Operating Segments | Electricity sales | Energy Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Home Services and Other |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 11,681 |  |  | 23,626 |
Alternative revenue programs |  | 0 |  |  | 0 |
Derivative Instruments |  | 0 |  |  | 0 |
Revenues out of scope |  | 0 |  |  | 0 |
Total operating revenues |  | 11,681 |  |  | 23,626 |
Unregulated | Home Services and Other | Natural gas utility sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Home Services and Other | Wholesale natural gas services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Home Services and Other | Service contracts |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 7,847 |  |  | 15,643 |
Unregulated | Home Services and Other | Installations and maintenance |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 4,486 |  |  | 9,180 |
Unregulated | Home Services and Other | Electricity sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers |  | 0 |  |  | 0 |
Unregulated | Eliminations |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers | [1] | (652) |  |  | (1,197) |
Revenues out of scope | [1] | 0 |  |  | 0 |
Unregulated | Eliminations | Clean Energy Ventures |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues out of scope | [1] | 0 |  |  | 0 |
Unregulated | Eliminations | Energy Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues out of scope | [1] | $ (6,031) |  |  | $ (8,338) |
[1] | Consists of transactions between subsidiaries that are eliminated in consolidation.

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