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Maintenance Contracts (Tables)
 9 Months Ended
Jan. 31, 2013
Maintenance Contracts [Abstract]  
Schedule Of Deferred Maintenance Revenue

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

January 31,

 

 

January 31,

 

 

2013

 

2012

 

 

2013

 

2012

Deferred maintenance revenue beginning balance

$
6,602 

$
6,802 

 

$
8,302 

$
8,420 

Deferred maintenance revenue recognized during period

 
(3,803)

 
(4,548)

 

 
(11,832)

 
(12,317)

Deferred maintenance revenue of new maintenance contracts

 
3,512 

 
6,075 

 

 
9,841 

 
12,226 

Deferred maintenance revenue ending balance

$
6,311 

$
8,329 

 

$
6,311 

$
8,329