Maintenance Contracts (Tables)

3 Months Ended

Jul. 31, 2013

Maintenance Contracts [Abstract]

Schedule Of Deferred Maintenance Revenue

		Three Months Ended
		July 31,
		2013		2012
Beginning balance	$	8,861	$	8,302
Revenue recognized during period		(3,544)		(3,683)
New maintenance contracts		2,262		2,534
Ending balance	$	7,579	$	7,153