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Product Warranty (Tables)
6 Months Ended
Oct. 31, 2019
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)20202019
Beginning balance at May 1$3,753 $4,616 
Accrual9,560 12,539 
Settlements(8,948)(12,294)
Ending balance at October 31$4,365 $4,861