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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 155,392	$ 157,024	$ 720,495	$ 712,554
Alternative revenue programs	577	(2,665)	(4,519)	17,465
Derivative instruments	210,702	144,418	912,118	825,261
Revenues out of scope	212,201	141,950	903,590	841,070
Total operating revenues	367,593	298,974	1,624,085	1,553,624
Natural gas utility sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	118,367	124,888	604,619	611,650
Natural gas services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	15,690	15,399	60,159	52,502
Service contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	8,333	8,126	24,906	24,237
Installations and maintenance
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4,979	4,243	13,756	13,404
Renewable energy certificates
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,568		3,075
Electricity sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	7,346	5,294	16,616	13,770
Operating Segments
Disaggregation of Revenue [Line Items]
Total operating revenues	354,250	287,334	1,592,068	1,520,648
Operating Segments | Natural Gas Distribution
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	118,367	124,888	604,619	611,650
Alternative revenue programs	577	(2,665)	(4,519)	17,465
Derivative instruments	8,682	6,309	33,422	16,260
Revenues out of scope	9,259	3,644	28,903	33,725
Total operating revenues	127,626	128,532	633,522	645,375
Operating Segments | Natural Gas Distribution | Natural gas utility sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	118,367	124,888	604,619	611,650
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	8,914	5,294	19,691	13,770
Alternative revenue programs	0	0	0	0
Derivative instruments	4,467	8,102	6,536	11,833
Revenues out of scope	4,467	8,102	6,536	11,833
Total operating revenues	13,381	13,396	26,227	25,603
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	1,568		3,075
Operating Segments | Clean Energy Ventures | Electricity sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	7,346	5,294	16,616	13,770
Operating Segments | Energy Services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4,041	3,536	21,480	20,491
Alternative revenue programs	0	0	0	0
Derivative instruments	197,553	130,007	872,160	797,168
Revenues out of scope	198,475	130,204	868,151	795,512
Total operating revenues	202,516	133,740	889,631	816,003
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	4,041	3,536	21,480	20,491
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	10,999	11,143	36,703	29,949
Alternative revenue programs	0	0	0	0
Derivative instruments	0	0	0	0
Revenues out of scope	0	0	0	0
Total operating revenues	10,999	11,143	36,703	29,949
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	11,649	11,863	38,679	32,011
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	13,071	12,163	38,002	36,694
Home Services and Other | Home Services and Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	13,071	12,163	38,002	36,694
Alternative revenue programs	0	0	0	0
Derivative instruments	0	0	0	0
Revenues out of scope	0	0	0	0
Total operating revenues	13,071	12,163	38,002	36,694
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	8,333	8,126	24,906	24,237
Home Services and Other | Home Services and Other | Installations and maintenance
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4,979	4,243	13,756	13,404
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	(891)	(926)	(2,636)	(3,009)
Revenues out of scope	922	197	(4,009)	(1,656)
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	922	197	(4,009)	(1,656)
Eliminations | Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(650)	(720)	(1,976)	(2,062)
Revenues out of scope	0	0	0	0
Eliminations | Home Services and Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(241)	(206)	(660)	(947)
Revenues out of scope	$ 0	$ 0	$ 0	$ 0

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