Summary of Significant Accounting Policies - Schedule of Geographic Makeup of Net Sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Disaggregation Of Revenue [Line Items]
Total net sales	$ 276,687	$ 167,379	$ 177,363
Change in Total net sales	$ 109,308
% Change in Total net sales	65.30%
Domestic Net Sales
Disaggregation Of Revenue [Line Items]
Total net sales	$ 267,573	160,905	170,621
Change in Total net sales	$ 106,668
% Change in Total net sales	66.30%
International Net Sales
Disaggregation Of Revenue [Line Items]
Total net sales	$ 9,114	$ 6,474	$ 6,742
Change in Total net sales	$ 2,640
% Change in Total net sales	40.80%