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Product Warranty (Tables)
6 Months Ended
Oct. 31, 2020
Product Warranties Disclosures [Abstract]  
Schedule of Warranty Liability
The following is a reconciliation of the Company's warranty liability, which is included in other accrued expenses on the unaudited condensed consolidated balance sheets: 
 Six Months Ended
 October 31,
(in thousands)20212020
Beginning balance at May 1$5,249 $3,753 
Accrual9,892 9,560 
Settlements(9,198)(8,948)
Ending balance at October 31$5,943 $4,365