Leases - Schedule of Other Information (Detail) - lease	Sep. 30, 2020	Sep. 30, 2019
Weighted average remaining lease term (in years):
Operating leases	7 years 1 month 6 days	8 years
Financing leases	2 years 9 months 18 days	4 years 2 months 12 days
Weighted average discount rate:
Operating leases	5.10%	5.20%
Financing leases	5.20%	5.40%
Additional leases not yet commenced (undiscounted):
Operating leases expected to commence in remainder of year	1