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Uncompleted Contracts - Summary (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 27, 2013
Apr. 28, 2012
Contractors [Abstract]    
Costs incurred $ 393,287 $ 304,058
Estimated earnings 146,378 114,687
Costs and estimated earnings on uncompleted contracts 539,665 418,745
Less billings to date 514,555 410,110
Costs in excess of billings, net $ 25,110 $ 8,635