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Product Warranty (Tables)
6 Months Ended
Oct. 31, 2016
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: 
 

Six Months Ended
 

October 31,
(in thousands)

2017

2016
Beginning balance at May 1

$
3,262


$
2,926

Accrual

10,076


9,314

Settlements

(9,791
)

(9,060
)







Ending balance at October 31

$
3,547


$
3,180