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Leases (Details 4)
Jan. 31, 2022
Apr. 30, 2021
Leases [Abstract]    
Operating leases, Weighted average remaining lease term 3 years 9 months 18 days 4 years 4 months 24 days
Finance leases, Weighted average remaining lease term 3 years 3 years 1 month 6 days
Operating leases, Weighted average discount rate 2.50% 2.50%
Finance leases, Weighted average discount rate 2.10% 2.60%