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Maintenance Contracts (Tables)
 6 Months Ended
Oct. 31, 2012
Maintenance Contracts [Abstract]  
Schedule Of Deferred Maintenance Revenue

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended

 

 

Six Months Ended

 

 

October 31,

 

 

October 31,

 

 

2012

 

2011

 

 

2012

 

2011

Deferred maintenance revenue beginning balance

$
7,153 

$
7,367 

 

$
8,302 

$
8,420 

Deferred maintenance revenue recognized during period

 
(4,346)

 
(3,903)

 

 
(8,028)

 
(7,770)

Deferred maintenance revenue of new maintenance contracts

 
3,795 

 
3,338 

 

 
6,328 

 
6,152 

Deferred maintenance revenue ending balance

$
6,602 

$
6,802 

 

$
6,602 

$
6,802