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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 28, 2017 | Jan. 23, 2016 | Jan. 28, 2017 | Jan. 23, 2016 | Jul. 30, 2016
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets Gross Excluding Goodwill | $ 304,952 |  | $ 304,952 |  | $ 309,920
Accumulated amortization: | 119,384 |  | 119,384 |  | 112,041
Intangible assets, net | 185,568 |  | 185,568 |  | 197,879
Decrease in intangible assets | 4,800 |  |  |  |
Amortization of intangible assets | $ 6,100 | $ 4,700 | 12,300 | $ 9,500 |
Customer relationships |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average remaining useful lives (in years) | 12 years 4 months 1 day |  |  |  |
Carrying amount | $ 289,917 |  | 289,917 |  | 289,955
Accumulated amortization: | $ 112,395 |  | 112,395 |  | 101,012
Contract backlog |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average remaining useful lives (in years) | 0 years |  |  |  |
Carrying amount | $ 0 |  | 0 |  | 4,780
Accumulated amortization: | $ 0 |  | 0 |  | 4,666
Trade names |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average remaining useful lives (in years) | 7 years 7 months 1 day |  |  |  |
Carrying amount | $ 9,650 |  | 9,650 |  | 9,800
Accumulated amortization: | $ 6,556 |  | 6,556 |  | 6,034
Non-compete agreements |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average remaining useful lives (in years) | 2 years 5 months 1 day |  |  |  |
Carrying amount | $ 685 |  | 685 |  | 685
Accumulated amortization: | 433 |  | 433 |  | 329
UtiliQuest |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
UtiliQuest trade name | $ 4,700 |  | $ 4,700 |  | $ 4,700

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- Definition Finite-Lived and Indefinite-Lived Intangible Assets + References No definition available. + Details
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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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: 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=66902209&loc=d3e3602-108585 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=66006027&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=66006027&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=66006027&loc=d3e16323-109275 + Details
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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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=66006027&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=66006027&loc=d3e16323-109275 + Details
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