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REVENUE Timing of Revenue Recognition - Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Sep. 30, 2018
Customer accounts receivable
Billed		$ 318,108	$ 205,490
Unbilled revenues		55,155	7,199
Customers' credit		(29,629)	(27,325)
Customers accounts receivables & Customers' credit balances and deposits		343,634
Natural Gas Distribution
Customer accounts receivable
Billed	[1]	73,748	39,151
Clean Energy Ventures
Customer accounts receivable
Billed		3,574	3,330
Energy Services
Customer accounts receivable
Billed		237,790	$ 157,936
Operating Segments | Natural Gas Distribution
Customer accounts receivable
Billed		73,748
Unbilled revenues		55,155
Customers' credit		(29,627)
Customers accounts receivables & Customers' credit balances and deposits		99,276
Operating Segments | Clean Energy Ventures
Customer accounts receivable
Billed		3,574
Unbilled revenues		0
Customers' credit		0
Customers accounts receivables & Customers' credit balances and deposits		3,574
Operating Segments | Energy Services
Customer accounts receivable
Billed		239,542
Unbilled revenues		0
Customers' credit		0
Customers accounts receivables & Customers' credit balances and deposits		239,542
Home Services and Other
Customer accounts receivable
Billed		2,996
Unbilled revenues		0
Customers' credit		(2)
Customers accounts receivables & Customers' credit balances and deposits		2,994
Eliminations
Customer accounts receivable
Billed		1,752
Unbilled revenues		0
Customers' credit		0
Customers accounts receivables & Customers' credit balances and deposits		$ 1,752
[1] Does not include unbilled revenues of $55.2 million and $7.2 million as of December 31, 2018 and September 30, 2018, respectively.

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