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Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 30, 2016	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Receivables [Abstract]
Trade Receivables Sold	$ 95,300
Contract billings	297,532	$ 297,532	$ 292,029
Retainage	32,101	32,101	24,321
Total	329,633	329,633	316,350
Less: allowance for doubtful accounts	(1,603)	(1,603)	(1,216)
Accounts receivable, net	328,030	328,030	315,134
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of period		1,216	836
Bad debt expense, net		1,252	465	$ 615
Amounts charged against the allowance		(865)	(85)
Allowance for doubtful accounts at end of period	$ 1,603	$ 1,603	$ 1,216	$ 836

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Contract Receivable Retainage and Other Receivables

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For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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Amount of deductions to trade receivables held-for-sale, after allowance for bad debt, that are not part of a disposal group.

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