- OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands		Sep. 30, 2017		Sep. 30, 2016
Energy Services
Derivative assets:
Amounts Presented on the Balance Sheets		$ 39,094		$ 34,076
Offsetting Derivative Instruments		(16,294)		(20,783)
Financial Collateral Received/Pledged		(200)		(6,904)
Net Amounts	[1]	22,600		6,389
Derivative liabilities:
Amounts Presented in Balance Sheets		48,186		58,740
Offsetting Derivative Instruments		(16,294)		(20,783)
Financial Collateral Received/Pledged		(8,766)		(26,691)
Net Amounts	[1]	23,126		11,266
Energy Services | Physical commodity contracts
Derivative assets:
Amounts Presented on the Balance Sheets		21,715		9,981
Offsetting Derivative Instruments		(2,173)		(2,837)
Financial Collateral Received/Pledged		(200)		(755)
Net Amounts	[1]	19,342		6,389
Derivative liabilities:
Amounts Presented in Balance Sheets		25,299		12,872
Offsetting Derivative Instruments		(2,173)		(2,837)
Financial Collateral Received/Pledged		0		1,200
Net Amounts	[1]	23,126		11,235
Energy Services | Financial commodity contracts
Derivative assets:
Amounts Presented on the Balance Sheets		17,335		24,094
Offsetting Derivative Instruments		(14,121)		(17,945)
Financial Collateral Received/Pledged		0		(6,149)
Net Amounts	[1]	3,214		0
Derivative liabilities:
Amounts Presented in Balance Sheets		22,887		45,836
Offsetting Derivative Instruments		(14,121)		(17,945)
Financial Collateral Received/Pledged		(8,766)		(27,891)
Net Amounts	[1]	0		0
Energy Services | Foreign currency contracts
Derivative assets:
Amounts Presented on the Balance Sheets		44		1
Offsetting Derivative Instruments		0		(1)
Financial Collateral Received/Pledged		0		0
Net Amounts		44		0	[1]
Derivative liabilities:
Amounts Presented in Balance Sheets		0		32
Offsetting Derivative Instruments		0		(1)
Financial Collateral Received/Pledged		0		0
Net Amounts	[1]	0		31
Natural Gas Distribution
Derivative assets:
Amounts Presented on the Balance Sheets		151		1,115
Offsetting Derivative Instruments		(20)		(911)
Financial Collateral Received/Pledged		0		0
Net Amounts	[1]	131		204
Derivative liabilities:
Amounts Presented in Balance Sheets		9,688		27,592
Offsetting Derivative Instruments		(20)		(911)
Financial Collateral Received/Pledged		(1,149)		(2,485)
Net Amounts		8,519	[1]	24,196
Natural Gas Distribution | Physical commodity contracts
Derivative assets:
Amounts Presented on the Balance Sheets		151		235
Offsetting Derivative Instruments		(20)		(31)
Financial Collateral Received/Pledged		0		0
Net Amounts		131		204
Derivative liabilities:
Amounts Presented in Balance Sheets		72		1,154
Offsetting Derivative Instruments		(20)		(31)
Financial Collateral Received/Pledged		0		0
Net Amounts		52		1,123
Natural Gas Distribution | Financial commodity contracts
Derivative assets:
Amounts Presented on the Balance Sheets		0		880
Offsetting Derivative Instruments		0		(880)
Financial Collateral Received/Pledged		0		0
Net Amounts	[1]	0		0
Derivative liabilities:
Amounts Presented in Balance Sheets		1,149		3,365
Offsetting Derivative Instruments		0		(880)
Financial Collateral Received/Pledged		(1,149)		(2,485)
Net Amounts	[1]	0		0
Natural Gas Distribution | Interest rate contracts
Derivative assets:
Amounts Presented on the Balance Sheets		0		0
Offsetting Derivative Instruments		0		0
Financial Collateral Received/Pledged		0		0
Net Amounts	[1]	0		0
Derivative liabilities:
Amounts Presented in Balance Sheets		8,467		23,073
Offsetting Derivative Instruments		0		0
Financial Collateral Received/Pledged		0		0
Net Amounts		$ 8,467	[1]	$ 23,073

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