MAJOR CUSTOMERS (Details) - Customer Concentration Risk	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Concentration Risk [Line Items]
Customers concentration percentage	10.00%
Revenues
Concentration Risk [Line Items]
Customers concentration percentage	100.00%	100.00%
Revenues | TransCanada Corporation
Concentration Risk [Line Items]
Customers concentration percentage	11.00%	24.70%
Revenues | Marathon Petroleum
Concentration Risk [Line Items]
Customers concentration percentage		11.10%
Revenues | All Other
Concentration Risk [Line Items]
Customers concentration percentage	89.00%	64.20%
Revenues | Customer One
Concentration Risk [Line Items]
Customers concentration percentage	10.00%
Receivables
Concentration Risk [Line Items]
Customers concentration percentage	100.00%	100.00%
Receivables | TransCanada Corporation
Concentration Risk [Line Items]
Customers concentration percentage	13.20%	18.40%
Receivables | Marathon Petroleum
Concentration Risk [Line Items]
Customers concentration percentage		19.70%
Receivables | All Other
Concentration Risk [Line Items]
Customers concentration percentage	70.50%	50.00%
Receivables | Shimizu North American LLC
Concentration Risk [Line Items]
Customers concentration percentage		11.90%
Receivables | Kentucky American Water
Concentration Risk [Line Items]
Customers concentration percentage	16.30%
Receivables | Customer Two
Concentration Risk [Line Items]
Customers concentration percentage	10.00%