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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified |  |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 26, 2013 | Jul. 27, 2013 | Dec. 03, 2012 | Oct. 26, 2013 Customer Relationships | Jul. 27, 2013 Customer Relationships | Oct. 26, 2013 Contract Backlog | Jul. 27, 2013 Contract Backlog | Oct. 26, 2013 Trade Names | Jul. 27, 2013 Trade Names | Oct. 26, 2013 UtiliQuest trade name | Jul. 27, 2013 UtiliQuest trade name | Oct. 26, 2013 Noncompete Agreements | Jul. 27, 2013 Noncompete Agreements
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Remaining, Useful Lives |  |  |  | 12 years 1 month 6 days |  | 2 years 3 months 18 days |  | 4 years 9 months 18 days |  | 0 years |  | 4 years 1 month 6 days |
Carrying amount |  |  | $ 90,600 | $ 164,394 | $ 164,497 | $ 15,285 | $ 15,285 | $ 8,200 | $ 8,200 |  |  | $ 400 | $ 400
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  | 4,700 | 4,700 |  |
Gross Intangible Assets | 192,979 | 193,082 |  |  |  |  |  |  |  |  |  |  |
Accumulated Amortization |  |  |  | 59,454 | 56,219 | 11,006 | 9,433 | 2,394 | 2,071 |  |  | 104 | 84
Net Intangible Assets | $ 120,021 | $ 125,275 |  |  |  |  |  |  |  |  |  |  |

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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 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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