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Product Warranty (Tables)
3 Months Ended
Jul. 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: 
 Three Months Ended
 July 31,
(in thousands)20202019
Beginning balance at May 1$3,753 $4,616 
Accrual4,303 6,453 
Settlements(4,138)(6,219)
Ending balance at July 31$3,918 $4,850