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Uncompleted Contracts - Costs in Excess of Billings (Details) (USD $) In Thousands, unless otherwise specified	Apr. 27, 2013	Apr. 28, 2012
Contractors [Abstract]
Costs and estimated earnings in excess of billings	$ 39,355	$ 23,020
Billings in excess of costs and estimated earnings	(14,245)	(14,385)
Costs in excess of billings, net	$ 25,110	$ 8,635

X

- Definition

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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- Definition

Total amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable.

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