Product Warranty (Tables)

6 Months Ended

Oct. 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: 

	Six Months Ended
	October 31,
(in thousands)	2018			2017
Beginning balance at May 1	$	4,045		$	3,262
Accrual	13,205			10,076
Settlements	(12,604		)	(9,791		)
Ending balance at October 31	$	4,646		$	3,547