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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended |
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Apr. 23, 2016 | Jul. 25, 2015
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Intangible Assets Gross Excluding Goodwill | $ 231,540 | $ 216,986
Accumulated amortization: | 106,648 | 96,060
Intangible assets, net | 124,892 | 120,926
Finite-Lived Intangible Assets, Period Increase (Decrease) | $ 3,400 |
Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted average remaining useful lives (in years) | 11 years 4 months 24 days |
Carrying amount | $ 211,575 | 195,375
Accumulated amortization: | $ 96,133 | 83,772
Contract backlog |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted average remaining useful lives (in years) | 7 months 6 days |
Carrying amount | $ 4,780 | 8,076
Accumulated amortization: | $ 4,569 | 7,381
Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted average remaining useful lives (in years) | 7 years |
Carrying amount | $ 9,800 | 8,200
Accumulated amortization: | $ 5,673 | 4,650
Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted average remaining useful lives (in years) | 2 years 8 months 12 days |
Carrying amount | $ 685 | 635
Accumulated amortization: | 273 | 257
UtiliQuest |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
UtiliQuest trade name | $ 4,700 | $ 4,700

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