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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 339,376 | $ 303,400 | $ 565,103 | $ 555,530
Alternative revenue programs | (6,664) | 22,073 | (5,096) | 20,130
Derivative instruments | 472,278 | 313,883 | 24,740 | 680,843
Revenues out of scope | 462,811 | 336,214 | 691,389 | 699,120
Total operating revenues | 802,187 | 639,614 | 1,256,492 | 1,254,650
Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 296,888 | 266,868 | 486,252 | 486,762
Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 24,937 | 20,710 | 44,469 | 37,103
Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,314 | 8,073 | 16,573 | 16,111
Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,459 | 4,292 | 8,777 | 9,161
Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 817 |  | 1,507 |
Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,882 | 4,458 | 9,270 | 8,476
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 793,138 | 627,992 | 1,237,818 | 1,233,314
Operating Segments | Natural Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 296,888 | 266,868 | 486,252 | 486,762
Alternative revenue programs | (6,664) | 22,073 | (5,096) | 20,130
Derivative instruments | 19,943 | 8,279 | 24,740 | 9,951
Revenues out of scope | 13,279 | 30,352 | 19,644 | 30,081
Total operating revenues | 310,167 | 297,220 | 505,896 | 516,843
Operating Segments | Natural Gas Distribution | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 296,888 | 266,868 | 486,252 | 486,762
Operating Segments | Natural Gas Distribution | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Operating Segments | Natural Gas Distribution | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Ventures |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 5,699 | 4,458 | 10,777 | 8,476
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 777 | 1,537 | 2,069 | 3,731
Revenues out of scope | 777 | 1,537 | 2,069 | 3,731
Total operating revenues | 6,476 | 5,995 | 12,846 | 12,207
Operating Segments | Clean Energy Ventures | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 817 |  | 1,507 |
Operating Segments | Clean Energy Ventures | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,882 | 4,458 | 9,270 | 8,476
Operating Segments | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,011 | 9,634 | 17,439 | 16,955
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 451,558 | 304,067 | 674,607 | 667,161
Revenues out of scope | 448,755 | 304,325 | 669,676 | 665,308
Total operating revenues | 459,766 | 313,959 | 687,115 | 682,263
Operating Segments | Energy Services | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Energy Services | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,011 | 9,634 | 17,439 | 16,955
Operating Segments | Energy Services | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Energy Services | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Energy Services | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Operating Segments | Energy Services | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Storage and Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 13,257 | 10,401 | 25,704 | 18,806
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 13,257 | 10,401 | 25,704 | 18,806
Operating Segments | Storage and Transportation | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Storage and Transportation | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 13,926 | 11,076 | 27,030 | 20,148
Operating Segments | Storage and Transportation | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Storage and Transportation | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Storage and Transportation | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Operating Segments | Storage and Transportation | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 12,521 | 12,039 | 24,931 | 24,531
Home Services and Other | Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,521 | 12,039 | 24,931 | 24,531
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 12,521 | 12,039 | 24,931 | 24,531
Home Services and Other | Home Services and Other | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Home Services and Other | Home Services and Other | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Home Services and Other | Home Services and Other | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,314 | 8,073 | 16,573 | 16,111
Home Services and Other | Home Services and Other | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,459 | 4,292 | 8,777 | 9,161
Home Services and Other | Home Services and Other | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Home Services and Other | Home Services and Other | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (921) | (1,001) | (1,745) | (2,083)
Revenues out of scope | (2,803) | 258 | (4,931) | (1,853)
Eliminations | Natural Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Eliminations | Clean Energy Ventures |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Eliminations | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Revenues out of scope | (2,803) | 258 | (4,931) | (1,853)
Eliminations | Storage and Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (669) | (675) | (1,326) | (1,342)
Revenues out of scope | 0 | 0 | 0 | 0
Eliminations | Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (252) | (326) | (419) | (741)
Revenues out of scope | $ 0 | $ 0 | $ 0 | $ 0

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