Leases - Additional Information (Details)	12 Months Ended
	Sep. 30, 2020
Leased Assets [Line Items]
Lease renewal option term	one or more exercisable renewal periods and specified increases in lease payments upon exercise of the renewal options.
Maximum
Leased Assets [Line Items]
Remaining lease terms	13 years
Minimum
Leased Assets [Line Items]
Remaining lease terms	1 month