7. LEASES - Weighted-average Remaining Lease Terms (Details)	Mar. 31, 2022	Sep. 30, 2021
Leases [Abstract]
Weighted-average remaining lease term - operating leases	4 years 6 months 14 days	5 years
Weighted-average remaining lease term - finance leases	1 year 9 months 10 days	3 years 2 months 12 days
Weighted-average discount rate - operating leases	4.50%	4.50%
Weighted-average discount rate - finance leases	5.50%	5.50%