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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 26, 2014 | Apr. 27, 2013 | Apr. 26, 2014 | Apr. 27, 2013 | Jul. 27, 2013 | Dec. 03, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Amortization of Intangible Assets | $ 4,100,000 | $ 7,100,000 | $ 14,100,000 | $ 13,600,000 |  |
Carrying amount |  |  |  |  |  | 90,600,000
Gross Intangible Assets | 193,679,000 |  | 193,679,000 |  | 193,082,000 |
Net Intangible Assets | 111,819,000 |  | 111,819,000 |  | 125,275,000 |
Customer Relationships |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Carrying amount | 165,094,000 |  | 165,094,000 |  | 164,497,000 |
Accumulated Amortization | 65,795,000 |  | 65,795,000 |  | 56,219,000 |
Contract Backlog |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Carrying amount | 15,285,000 |  | 15,285,000 |  | 15,285,000 |
Accumulated Amortization | 12,883,000 |  | 12,883,000 |  | 9,433,000 |
Trade Names |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Carrying amount | 8,200,000 |  | 8,200,000 |  | 8,200,000 |
Accumulated Amortization | 3,038,000 |  | 3,038,000 |  | 2,071,000 |
UtiliQuest trade name |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite-Lived Intangible Assets | 4,700,000 |  | 4,700,000 |  | 4,700,000 |
Noncompete Agreements |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Carrying amount | 400,000 |  | 400,000 |  | 400,000 |
Accumulated Amortization | $ 144,000 |  | $ 144,000 |  | $ 84,000 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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