Leases (Details 4)	Jul. 31, 2022	Apr. 30, 2022
Leases [Abstract]
Operating leases, Weighted average remaining lease term	3 years 6 months	3 years 7 months 6 days
Finance leases, Weighted average remaining lease term	3 years 6 months	3 years 3 months 18 days
Operating leases, Weighted average discount rate	2.50%	2.50%
Finance leases, Weighted average discount rate	2.20%	2.10%