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Segment Data (Tables)
12 Months Ended
Apr. 30, 2014
Segment Data  
Schedule of segment results

The segment results are as follows (in thousands):

 
  Year Ended April 30,  
 
  2014   2013   2012  

Revenue:

                   

UAS

  $ 208,810   $ 194,276   $ 273,728  

EES

    42,893     45,876     51,280  
               

Total

    251,703     240,152     325,008  

Cost of sales:

                   

UAS

    127,992     115,194     157,663  

EES

    30,098     32,422     38,012  
               

Total

    158,090     147,616     195,675  
               

Gross margin:

                   

UAS

    80,818     79,082     116,065  

EES

    12,795     13,454     13,268  
               

Total

    93,613     92,536     129,333  
               

Selling, general and administrative

    55,679     51,520     55,280  

Research and development

    25,515     37,214     30,977  
               

Income from operations

    12,419     3,802     43,076  

Interest income

    855     726     462  

Other income

    1,622     6,245      
               

Income before income taxes

  $ 14,896   $ 10,773   $ 43,538