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Uncompleted Contracts - Costs in Excess of Billings (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 26, 2014
Apr. 27, 2013
Contractors [Abstract]    
Costs and estimated earnings in excess of billings $ 33,400 $ 39,355
Billings in excess of costs and estimated earnings (22,483) (14,245)
Costs in excess of billings, net $ 10,917 $ 25,110