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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 27, 2018 | Oct. 28, 2017 | Oct. 27, 2018 | Oct. 28, 2017 | Jan. 27, 2018
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of intangible assets | $ 5,800 | $ 6,300 | $ 17,200 | $ 18,800 |
Intangible Assets, Gross (Excluding Goodwill) | 327,267 |  | 327,267 |  | $ 315,217
Accumulated Amortization | 160,717 |  | 160,717 |  | 143,748
Intangible Assets, Net | 166,550 |  | 166,550 |  | 171,469
UtiliQuest |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 4,700 |  | 4,700 |  | 4,700
Accumulated Amortization | 0 |  | 0 |  | 0
Intangible Assets, Net | $ 4,700 |  | 4,700 |  | 4,700
Customer relationships |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Usesul life | 11 years 3 months |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 312,017 |  | 312,017 |  | 299,717
Accumulated Amortization | 152,380 |  | 152,380 |  | 135,544
Intangible Assets, Net | $ 159,637 |  | 159,637 |  | 164,173
Trade names |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Usesul life | 8 years 1 month |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 10,350 |  | 10,350 |  | 10,350
Accumulated Amortization | 8,208 |  | 8,208 |  | 7,872
Intangible Assets, Net | $ 2,142 |  | 2,142 |  | 2,478
Non-compete agreements |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Usesul life | 1 year 9 months |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 200 |  | 200 |  | 450
Accumulated Amortization | 129 |  | 129 |  | 332
Intangible Assets, Net | $ 71 |  | $ 71 |  | $ 118

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://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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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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