Product Warranty (Tables)

3 Months Ended

Jul. 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: 

	Three Months Ended
	July 31,
(in thousands)	2017			2016
Beginning balance at May 1	$	3,262		$	2,926
Accrual	5,144			4,420
Settlements	(4,880		)	(4,334		)
Ending balance at July 31	$	3,526		$	3,012