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Product Warranty (Tables)
 3 Months Ended
Jul. 31, 2018
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 balance sheet: 
 

Three Months Ended
 

July 31,
(in thousands)

2019

2018
Beginning balance at May 1

$
4,616


$
4,045

Accrual

6,453


6,273

Settlements

(6,219
)

(5,823
)







Ending balance at July 31

$
4,850


$
4,495