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REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Customer accounts receivable
Billed	$ 205,482	$ 134,173
Unbilled revenues	12,663	9,226
Customers' credit balances and deposits	(22,699)	$ (25,934)
Customers accounts receivables & Customers' credit balances and deposits	195,446
Operating Segments | Natural Gas Distribution
Customer accounts receivable
Billed	76,254
Unbilled revenues	9,072
Customers' credit balances and deposits	(22,699)
Customers accounts receivables & Customers' credit balances and deposits	62,627
Operating Segments | Clean Energy Ventures
Customer accounts receivable
Billed	5,524
Unbilled revenues	3,591
Customers' credit balances and deposits	0
Customers accounts receivables & Customers' credit balances and deposits	9,115
Operating Segments | Energy Services
Customer accounts receivable
Billed	118,234
Unbilled revenues	0
Customers' credit balances and deposits	0
Customers accounts receivables & Customers' credit balances and deposits	118,234
Operating Segments | Storage and Transportation
Customer accounts receivable
Billed	3,662
Unbilled revenues	0
Customers' credit balances and deposits	0
Customers accounts receivables & Customers' credit balances and deposits	3,662
Home Services and Other
Customer accounts receivable
Billed	1,808
Unbilled revenues	0
Customers' credit balances and deposits	0
Customers accounts receivables & Customers' credit balances and deposits	$ 1,808

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+ References

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- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

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-Publisher FASB
-Name Accounting Standards Codification
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