Product Warranty (Tables)

3 Months Ended

Jul. 31, 2013

Product Warranty [Abstract]

Schedule Of Warranty Liability

	Three Months Ended
	July 31,
(in thousands)	2013		2012
Beginning balance at May 1	$	1,795	$	1,885
Accrual		2,546		2,257
Settlements		(2,596)		(2,160)
Ending balance at July 31	$	1,745	$	1,982