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Goodwill and Intangible Assets (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 27, 2013 | Apr. 28, 2012 | Apr. 27, 2013 | Apr. 28, 2012 | Dec. 03, 2012 | Jul. 28, 2012
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill, Gross | $ 456,475,000 |  | $ 456,475,000 |  |  | $ 370,616,000
Goodwill, Impaired, Accumulated Impairment Loss | (195,767,000) |  | (195,767,000) |  |  | (195,767,000)
Goodwill | 260,708,000 |  | 260,708,000 |  | 85,900,000 | 174,849,000
Goodwill, Acquired During Period |  |  | 85,859,000 |  |  |
Goodwill, Impairment Loss |  |  | 0 |  |  |
Goodwill, Period Increase (Decrease) |  |  | 85,859,000 |  |  |
Carrying amount |  |  |  |  | 91,100,000 |
Intangible Assets Gross Excluding Goodwill | 187,930,000 |  | 187,930,000 |  |  | 96,855,000
Net Intangible Assets | 127,252,000 |  | 127,252,000 |  |  | 49,773,000
Amortization expense for finite-lived intangible assets | 7,100,000 | 1,600,000 | 13,600,000 | 4,900,000 |  |
UtiliQuest |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  |  | 35,600,000
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  |  |  |  |  | 4,700,000
Margin of Excess of Fair Value Over Carrying Value |  |  |  |  |  | 30.00%
Customer Relationships |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles |  |  |  |  | 71,500,000 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 15 years |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 12 years 6 months 12 days |  |  |
Carrying amount | 160,645,000 |  | 160,645,000 |  |  | 89,145,000
Accumulated amortization | 53,335,000 |  | 53,335,000 |  |  | 45,852,000
Backlog |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles |  |  |  |  | 14,400,000 |
Contract Backlog |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 2 years 6 months 12 days |  |  |
Carrying amount | 14,410,000 |  | 14,410,000 |  |  | 0
Accumulated amortization | 5,497,000 |  | 5,497,000 |  |  | 0
Trade Names |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles |  |  |  |  | 5,200,000 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 5 years |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 5 years 4 months |  |  |
Carrying amount | 8,025,000 |  | 8,025,000 |  |  | 2,860,000
Accumulated amortization | 1,774,000 |  | 1,774,000 |  |  | 1,182,000
UtiliQuest trade name |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 0 years |  |  |
Noncompete Agreements |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 2 years 8 months 24 days |  |  |
Carrying amount | 150,000 |  | 150,000 |  |  | 150,000
Accumulated amortization | $ 72,000 |  | $ 72,000 |  |  | $ 48,000
Minimum | Contract Backlog |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 1 year |  |  |
Maximum | Contract Backlog |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 4 years |  |  |

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