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Goodwill and Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Oct. 25, 2014 | Jul. 26, 2014
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Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Intangible Assets Gross Excluding Goodwill | $ 206,237 | $ 202,179
Accumulated amortization | 88,413 | 86,063
Net Intangible Assets | 117,824 | 116,116
Customer Relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Carrying amount | 179,391 | 173,594
Accumulated amortization | 72,483 | 69,048
Backlog |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Carrying amount | 13,546 | 15,285
Accumulated amortization | 12,063 | 13,490
Trade Names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Carrying amount | 8,200 | 8,200
Accumulated amortization | 3,683 | 3,361
Noncompete Agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Carrying amount | 400 | 400
Accumulated amortization | 184 | 164
UtiliQuest |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | $ 4,700 | $ 4,700

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