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REVENUE Disaggregated Revenue - Type (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
Revenues out of scope	587,618
Total operating revenues	811,767	$ 705,305
Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	147,539
Commercial and industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	56,045
Firm transportation
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	18,934
Interruptible and off-tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,631
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
Unregulated | Home Services and Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	11,945
Revenues out of scope	0
Total operating revenues	11,945
Unregulated | Home Services and Other | Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	11,717
Unregulated | Home Services and Other | Commercial and industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	228
Unregulated | Home Services and Other | Firm transportation
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0
Unregulated | Home Services and Other | Interruptible and off-tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0
Natural Gas Distribution | Regulated | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	194,983
Revenues out of scope	4,982
Total operating revenues	199,965
Natural Gas Distribution | Regulated | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	133,690
Natural Gas Distribution | Regulated | Operating Segments | Commercial and industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	40,728
Natural Gas Distribution | Regulated | Operating Segments | Firm transportation
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	18,934
Natural Gas Distribution | Regulated | Operating Segments | Interruptible and off-tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,631
Clean Energy Ventures | Unregulated | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	7,141
Revenues out of scope	7,756
Total operating revenues	14,897
Clean Energy Ventures | Unregulated | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,132
Clean Energy Ventures | Unregulated | Operating Segments | Commercial and industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	5,009
Clean Energy Ventures | Unregulated | Operating Segments | Firm transportation
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0
Clean Energy Ventures | Unregulated | Operating Segments | Interruptible and off-tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0
Energy Services | Unregulated | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	10,080
Revenues out of scope	574,880
Total operating revenues	584,960
Energy Services | Unregulated | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0
Energy Services | Unregulated | Operating Segments | Commercial and industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	10,080
Energy Services | Unregulated | Operating Segments | Firm transportation
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0
Energy Services | Unregulated | Operating Segments | Interruptible and off-tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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