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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 25, 2020 | Jul. 27, 2019 | Jul. 25, 2020 | Jul. 27, 2019 | Jan. 25, 2020
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of intangible assets | $ 5,200 | $ 5,300 | $ 10,400 | $ 10,700 |
Intangible Assets, Gross (Excluding Goodwill) | 327,267 |  | 327,267 |  | $ 327,267
Accumulated Amortization | 197,741 |  | 197,741 |  | 187,322
Intangible Assets, Net | 129,526 |  | 129,526 |  | 139,945
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 | 9 years 9 months 18 days |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 312,017 |  | 312,017 |  | 312,017
Accumulated Amortization | 188,601 |  | 188,601 |  | 178,411
Intangible Assets, Net | $ 123,416 |  | 123,416 |  | 133,606
Trade names |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Usesul life | 7 years 10 months 24 days |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 10,350 |  | 10,350 |  | 10,350
Accumulated Amortization | 8,941 |  | 8,941 |  | 8,732
Intangible Assets, Net | $ 1,409 |  | 1,409 |  | 1,618
Non-compete agreements |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Usesul life | 1 month 6 days |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 200 |  | 200 |  | 200
Accumulated Amortization | 199 |  | 199 |  | 179
Intangible Assets, Net | $ 1 |  | $ 1 |  | $ 21

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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=118932676&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://www.xbrl.org/2003/role/disclosureRef -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 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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