Concentrations (Details) - Customer Concentration Risk	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Accounts Receivable | Customer A
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	35.00%
Accounts Receivable | Customer B
Concentration Risk [Line Items]
Concentration risk percentage	52.00%
Accounts Receivable | Customer C
Concentration Risk [Line Items]
Concentration risk percentage		11.00%
Accounts Receivable | Customer D
Concentration Risk [Line Items]
Concentration risk percentage		15.00%
Accounts Receivable | Customer E
Concentration Risk [Line Items]
Concentration risk percentage		11.00%
Revenue | Customer A
Concentration Risk [Line Items]
Concentration risk percentage	18.00%	32.00%	28.00%
Revenue | Customer B
Concentration Risk [Line Items]
Concentration risk percentage	30.00%
Revenue | Customer F
Concentration Risk [Line Items]
Concentration risk percentage	11.00%
Revenue | Customer G
Concentration Risk [Line Items]
Concentration risk percentage	10.00%
Revenue | Customer H
Concentration Risk [Line Items]
Concentration risk percentage		10.00%	16.00%
Revenue | Customer I
Concentration Risk [Line Items]
Concentration risk percentage		12.00%