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COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS, NET (Tables)
 6 Months Ended
Oct. 31, 2012
Contractors [Abstract]  
Costs and Estimated Earnings in Excess of Billings, Net

At October 31, 2012 and April 30, 2012, costs and estimated earnings in excess of billings, net, consist of the following:

 

    October 31, 2012     April 30, 2012  
    (In thousands)  
Costs and estimated earnings in excess of billings   $ 12,562     $ 9,552  
Billings in excess of costs and estimated earnings     (1,975 )     (2,345 )
Net asset   $ 10,587     $ 7,207