RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - ADDITIONAL INFORMATION (Details)	12 Months Ended
Jun. 30, 2019
Commodity Option
Derivative [Line Items]
Derivative, Term of Contract	1 year
Swap
Derivative [Line Items]
Derivative, Term of Contract	5 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration