- OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Sep. 30, 2017
Financial commodity contracts
Derivative assets:
Amounts Presented on the Balance Sheets	[1]	$ 94
Offsetting Derivative Instruments	[2]	0
Financial Collateral Received/Pledged	[3]	(94)
Net Amounts	[4]	0
Energy Services
Derivative assets:
Amounts Presented on the Balance Sheets	[1]	37,396	$ 39,094
Offsetting Derivative Instruments	[2]	(22,719)	(16,294)
Financial Collateral Received/Pledged	[3]	(200)	(200)
Net Amounts	[4]	14,477	22,600
Derivative liabilities:
Amounts Presented in Balance Sheets	[1]	69,442	48,186
Offsetting Derivative Instruments	[2]	(22,719)	(16,294)
Financial Collateral Received/Pledged	[3]	(20,949)	(8,766)
Net Amounts	[4]	25,774	23,126
Energy Services | Physical commodity contracts
Derivative assets:
Amounts Presented on the Balance Sheets	[1]	11,597	21,715
Offsetting Derivative Instruments	[2]	(3,944)	(2,173)
Financial Collateral Received/Pledged	[3]	(200)	(200)
Net Amounts	[4]	7,453	19,342
Derivative liabilities:
Amounts Presented in Balance Sheets	[1]	29,474	25,299
Offsetting Derivative Instruments	[2]	(3,944)	(2,173)
Financial Collateral Received/Pledged	[3]	0	0
Net Amounts	[4]	25,530	23,126
Energy Services | Financial commodity contracts
Derivative assets:
Amounts Presented on the Balance Sheets	[1]	25,799	17,335
Offsetting Derivative Instruments	[2]	(18,775)	(14,121)
Financial Collateral Received/Pledged	[3]	0	0
Net Amounts	[4]	7,024	3,214
Derivative liabilities:
Amounts Presented in Balance Sheets	[1]	39,724	22,887
Offsetting Derivative Instruments	[2]	(18,775)	(14,121)
Financial Collateral Received/Pledged	[3]	(20,949)	(8,766)
Net Amounts	[4]	0	0
Energy Services | Foreign currency contracts
Derivative assets:
Amounts Presented on the Balance Sheets	[1]		44
Offsetting Derivative Instruments	[2]		0
Financial Collateral Received/Pledged	[3]		0
Net Amounts	[4]		44
Derivative liabilities:
Amounts Presented in Balance Sheets	[1]	244
Offsetting Derivative Instruments	[2]	0
Financial Collateral Received/Pledged	[3]	0
Net Amounts	[4]	244
Natural Gas Distribution
Derivative assets:
Amounts Presented on the Balance Sheets	[1]	179	151
Offsetting Derivative Instruments	[2]	(3)	(20)
Financial Collateral Received/Pledged	[3]	(94)	0
Net Amounts	[4]	82	131
Derivative liabilities:
Amounts Presented in Balance Sheets	[1]	192	9,688
Offsetting Derivative Instruments	[2]	(3)	(20)
Financial Collateral Received/Pledged	[3]	0	(1,149)
Net Amounts	[4]	189	8,519
Natural Gas Distribution | Physical commodity contracts
Derivative assets:
Amounts Presented on the Balance Sheets	[1]	85	151
Offsetting Derivative Instruments	[2]	(3)	(20)
Financial Collateral Received/Pledged	[3]	0	0
Net Amounts	[4]	82	131
Derivative liabilities:
Amounts Presented in Balance Sheets	[1]	192	72
Offsetting Derivative Instruments	[2]	(3)	(20)
Financial Collateral Received/Pledged	[3]	0	0
Net Amounts	[4]	189	52
Natural Gas Distribution | Financial commodity contracts
Derivative liabilities:
Amounts Presented in Balance Sheets	[1]		1,149
Offsetting Derivative Instruments	[2]		0
Financial Collateral Received/Pledged	[3]		(1,149)
Net Amounts	[4]		0
Natural Gas Distribution | Interest rate contract
Derivative liabilities:
Amounts Presented in Balance Sheets	[1]		8,467
Offsetting Derivative Instruments	[2]		0
Financial Collateral Received/Pledged	[3]		0
Net Amounts	[4]		$ 8,467
Home Services and Other
Derivative assets:
Amounts Presented on the Balance Sheets	[1]	381
Offsetting Derivative Instruments	[2]	0
Financial Collateral Received/Pledged	[3]	0
Net Amounts	[4]	381
Home Services and Other | Interest rate contract
Derivative assets:
Amounts Presented on the Balance Sheets	[1]	381
Offsetting Derivative Instruments	[2]	0
Financial Collateral Received/Pledged	[3]	0
Net Amounts	[4]	$ 381

[1] Derivative assets and liabilities are presented on a gross basis in the balance sheet as the Company does not elect balance sheet offsetting under ASC 210-20.

[2] Offsetting derivative instruments include transactions with NAESB netting election, transactions held by FCMs with net margining and transactions with ISDA netting.

[3] Financial collateral includes cash balances at FCMs, as well as cash received from or pledged to other counterparties.

[4] Net amounts represent presentation of derivative assets and liabilities if the Company were to elect balance sheet offsetting under ASC 210-20.