16. MAJOR CUSTOMERS AND VENDORS - Energy segment major customers (Details)	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Energy Customer A [Member]
Concentration Risk, Percentage	48.88%	58.31%
Energy Customer B [Member]
Concentration Risk, Percentage	12.36%	0.00%
Energy Customer C [Member]
Concentration Risk, Percentage	0.00%	11.56%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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