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Costs and Estimated Earnings in Excess of Billings (Details) (USD $) In Thousands, unless otherwise specified	Jul. 27, 2013	Jul. 28, 2012
Contractors [Abstract]
Costs incurred on contracts in progress	$ 208,250	$ 100,766
Estimated to date earnings	49,150	26,555
Total costs and estimated earnings	257,400	127,321
Less: billings to date	(66,839)	(1,522)
Total costs in excess of billings	190,561	125,799
Costs and estimated earnings in excess of billings	204,349	127,321
Billings in excess of costs and estimated earnings	$ 13,788	$ 1,522

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

Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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