Maintenance Contracts (Tables)

3 Months Ended

Jul. 31, 2012

Maintenance Contracts [Abstract]

Schedule Of Deferred Maintenance Revenue

		Three Months Ended
		July 31,
		2012		2011
Deferred maintenance revenue beginning balance	$	8,302	$	8,420
Deferred maintenance revenue recognized during period		(3,683)		(3,867)
Deferred maintenance revenue of new maintenance contracts		2,534		2,814
Deferred maintenance revenue ending balance	$	7,153	$	7,367