9. LEASES - Weighted-average Remaining Lease Terms (Details)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
[custom:OperatingLeaseWeightedAverageRemainingLeaseTerm]	5 years	4 months 24 days
Finance Lease, Weighted Average Remaining Lease Term	3 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	4.50%	10.00%
Finance Lease, Weighted Average Discount Rate, Percent	5.50%