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Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 27, 2013
Jan. 26, 2013
Jul. 28, 2012
Apr. 28, 2012
Oct. 29, 2011
Jul. 30, 2011
Receivables [Abstract]            
Contract billings $ 222,148   $ 136,610      
Contract Receivable Retainage and Other Receivables 12,082   5,448      
Total 234,230   142,058      
Less: allowance for doubtful accounts (193) (279) (270) (269) (409) (368)
Accounts receivable, net $ 234,037   $ 141,788