Concentrations (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021	Apr. 30, 2021
Accounts Receivable | Customer A
Concentration Risk [Line Items]
Concentration risk percentage					35.00%
Accounts Receivable | Customer B
Concentration Risk [Line Items]
Concentration risk percentage			63.00%
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%
Accounts Receivable | Customer F
Concentration Risk [Line Items]
Concentration risk percentage			11.00%
Revenue | Customer A
Concentration Risk [Line Items]
Concentration risk percentage	22.00%	30.00%	18.00%	31.00%
Revenue | Customer B
Concentration Risk [Line Items]
Concentration risk percentage	40.00%		33.00%
Revenue | Customer C
Concentration Risk [Line Items]
Concentration risk percentage		15.00%
Revenue | Customer F
Concentration Risk [Line Items]
Concentration risk percentage			13.00%
Revenue | Customer G
Concentration Risk [Line Items]
Concentration risk percentage		17.00%
Revenue | Customer H
Concentration Risk [Line Items]
Concentration risk percentage				16.00%
Revenue | Customer I
Concentration Risk [Line Items]
Concentration risk percentage				14.00%