Leases - Summary of Information Relating to Lease Term and Discount Rate (Detail)	Sep. 30, 2020	Sep. 30, 2019
Weighted average remaining lease term (in months)
Operating leases	21 years 1 month 6 days	31 years 3 months 18 days
Finance leases	44 years 2 months 12 days	56 years 2 months 12 days
Weighted average discount rate
Operating leases	7.50%	7.50%
Finance leases	7.50%	7.50%