Accounts Receivable (Details) (USD $)	Apr. 25, 2015	Jul. 26, 2014	May 21, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract billings	$ 246,876,000us-gaap_BilledContractReceivables	$ 258,254,000us-gaap_BilledContractReceivables
Retainage and other receivables	19,894,000	15,323,000
Total	266,770,000us-gaap_AccountsReceivableGross	273,577,000us-gaap_AccountsReceivableGross
Less: allowance for doubtful accounts	(998,000)	(836,000)
Accounts receivable, net	265,772,000us-gaap_AccountsReceivableNet	272,741,000us-gaap_AccountsReceivableNet
Investments and Other Noncurrent Assets	4,000,000
Corporation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	17,700,000
Accounts receivable, net	13,100,000
Collection of Past Due Receivable Balance	7,100,000
Corporation \| Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collection of Past Due Receivable Balance			$ 5,800,000

Collection of Past Due Receivable Balance

No definition available.

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- Definition

Contract Receivable Retainage and Other Receivables

+ References

No definition available.

+ Details

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- Details

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- Definition

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.

+ References

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.9)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.5)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

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.

+ References

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- Definition

Aggregate carrying amount, as of the balance sheet date, of investments and other noncurrent assets not separately disclosed in the balance sheet due to materiality considerations. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References

No definition available.

+ Details

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- Details

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