Product Warranty (Tables)

3 Months Ended

Jul. 31, 2017

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)	2018			2017
Beginning balance at May 1	$	4,045		$	3,262
Accrual	6,273			5,144
Settlements	(5,823		)	(4,880		)
Ending balance at July 31	$	4,495		$	3,526