Concentration of Risk (Details) - Customer Concentration Risk	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Customer receivables | Customer A
Concentration Risk [Line Items]
Concentration risk (as a percent)	33.60%	31.20%
Customer receivables | Customer B
Concentration Risk [Line Items]
Concentration risk (as a percent)	17.20%	19.60%
Sales revenue, gross | Customer A
Concentration Risk [Line Items]
Concentration risk (as a percent)	30.30%	31.80%
Sales revenue, gross | Customer B
Concentration Risk [Line Items]
Concentration risk (as a percent)	14.20%	15.50%