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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jan. 26, 2019 | Jan. 27, 2018
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 327,267 | $ 315,217
Accumulated Amortization | 166,142 | 143,748
Intangible Assets, Net | 161,125 | 171,469
UtiliQuest |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Intangible Assets, Gross (Excluding Goodwill) | 4,700 | 4,700
Accumulated Amortization | 0 | 0
Intangible Assets, Net | $ 4,700 | 4,700
Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 11 years 1 month 6 days |
Intangible Assets, Gross (Excluding Goodwill) | $ 312,017 | 299,717
Accumulated Amortization | 157,691 | 135,544
Intangible Assets, Net | $ 154,326 | 164,173
Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 8 years |
Intangible Assets, Gross (Excluding Goodwill) | $ 10,350 | 10,350
Accumulated Amortization | 8,312 | 7,872
Intangible Assets, Net | $ 2,038 | 2,478
Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 1 year 6 months |
Intangible Assets, Gross (Excluding Goodwill) | $ 200 | 450
Accumulated Amortization | 139 | 332
Intangible Assets, Net | $ 61 | $ 118

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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://fasb.org/us-gaap/role/ref/legacyRef -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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