Product Warranty (Tables)

9 Months Ended

Jan. 31, 2014

Product Warranty [Abstract]

Schedule Of Warranty Liability

	Nine Months Ended
	January 31,
(in thousands)	2014		2013
Beginning balance at May 1	$	1,795	$	1,885
Accrual		8,447		6,959
Settlements		(8,607)		(7,168)
Ending balance at January 31	$	1,635	$	1,676