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Costs and Estimated Earnings in Excess of Billings, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Apr. 30, 2012
Costs and Estimated Earnings in Excess of Billings, Net [Line Items]    
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