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Product Warranty (Tables)
3 Months Ended
Jul. 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: 
 Three Months Ended
 July 31,
(in thousands)20212020
Beginning balance at May 1$5,249 $3,753 
Accrual4,814 4,303 
Settlements(4,559)(4,138)
Ending balance at July 31$5,504 $3,918