8. LEASES - Weighted-average Remaining Lease Terms (Details)	Jun. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Weighted-average remaining lease term - operating leases	4 years	3 years 2 months 12 days
Weighted-average remaining lease term - finance leases	2 years 1 month 6 days	1 year 6 months
Weighted-average discount rate - operating leases	5.40%	4.50%
Weighted-average discount rate - finance leases	5.50%	5.50%