CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
Apr. 25, 2015	Apr. 26, 2014
OPERATING ACTIVITIES:
Net income	$ 50,497us-gaap_NetIncomeLoss	$ 23,488us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities, net of acquisitions:
Depreciation and amortization	70,179	69,713
Bad debt expense, net	308us-gaap_ProvisionForDoubtfulAccounts	519us-gaap_ProvisionForDoubtfulAccounts
Gain on sale of fixed assets	(6,249)	(7,904)
Deferred income tax provision (benefit)	4,024us-gaap_DeferredIncomeTaxExpenseBenefit	(1,017)us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation	10,773us-gaap_ShareBasedCompensation	9,721us-gaap_ShareBasedCompensation
Amortization of premium on long-term debt	(296)	(275)
Amortization of debt issuance costs and other	1,490us-gaap_AmortizationOfFinancingCosts	1,428us-gaap_AmortizationOfFinancingCosts
Excess tax benefit from share-based awards	(5,224)	(2,837)
Change in operating assets and liabilities:
Accounts receivable, net	8,602	18,406
Costs and estimated earnings in excess of billings, net	(17,225)	5,381
Other current assets and inventory	(2,041)	(13,242)
Other assets	(7,511)	(646)
Income taxes receivable/payable	(1,317)	(8,827)
Accounts payable	(1,224)	(5,506)
Accrued liabilities, insurance claims, and other liabilities	18,798	9,089
Net cash provided by operating activities	123,584	97,491
INVESTING ACTIVITIES:
Cash paid for acquisitions, net of cash acquired	(9,821)	(700)
Capital expenditures	(76,825)	(70,585)
Proceeds from sale of assets	6,764	9,425
Changes in restricted cash	(541)	(305)
Other investing activities	(4,000)	0
Net cash used in investing activities	(84,423)	(62,165)
FINANCING ACTIVITIES:
Proceeds from borrowings on senior credit agreement, including term loan	310,750	337,000
Principal payments on senior credit agreement, including term loan	(321,563)	(375,469)
Debt issuance costs	(3,527)us-gaap_DebtIssuanceCosts	0us-gaap_DebtIssuanceCosts
Repurchases of common stock	(30,687)	(9,999)
Exercise of stock options	6,842	14,010
Restricted stock tax withholdings	(4,330)	(3,590)
Excess tax benefit from share-based awards	5,224	2,837
Net cash used in financing activities	(37,291)	(35,211)
Net increase in cash and equivalents	1,870	115
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	20,672	18,607
CASH AND EQUIVALENTS AT END OF PERIOD	22,542	18,722
Cash paid during the period for:
Interest	14,241us-gaap_InterestPaid	14,160us-gaap_InterestPaid
Income taxes	29,659us-gaap_IncomeTaxesPaid	26,106us-gaap_IncomeTaxesPaid
Purchases of capital assets included in accounts payable or other accrued liabilities at period end	$ 4,160	$ 4,328

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

Name:	us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to reacquire common stock during the period.

+ References

+ Details

Name:	us-gaap_PaymentsForRepurchaseOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_ProceedsFromLongTermLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleOfProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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.

+ References

+ Details

Name:	us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration