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Inventories
3 Months Ended
Jul. 31, 2011
Inventories [Abstract]  
Inventories
(5) Inventories:
The following sets forth a summary of inventories, stated at the lower of cost or market, as of July 31, 2011 and April 30, 2011 (in thousands):
                 
    July 31, 2011        
    (Unaudited)     April 30, 2011  
Finished goods
  $ 18,939     $ 15,409  
Finished parts
    20,670       18,845  
Work in process
    8,174       8,091  
Raw material
    9,784       9,375  
 
           
Total inventories
  $ 57,567     $ 51,720