Product Warranty (Tables)

6 Months Ended

Oct. 31, 2013

Product Warranty [Abstract]

Schedule Of Warranty Liability

	Six Months Ended
	October 31,
(in thousands)	2013		2012
Beginning balance at May 1	$	1,795	$	1,885
Accrual		5,950		4,953
Settlements		(5,820)		(4,747)
Ending balance at October 31	$	1,925	$	2,091