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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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