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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Jan. 26, 2019
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 5,300	$ 5,700
Intangible Assets, Gross (Excluding Goodwill)	327,267		$ 327,267
Accumulated Amortization	171,484		166,142
Intangible Assets, Net	155,783		161,125
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]
Usesul life	10 years 9 months
Intangible Assets, Gross (Excluding Goodwill)	$ 312,017		312,017
Accumulated Amortization	162,918		157,691
Intangible Assets, Net	$ 149,099		154,326
Trade names
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Usesul life	8 years
Intangible Assets, Gross (Excluding Goodwill)	$ 10,350		10,350
Accumulated Amortization	8,417		8,312
Intangible Assets, Net	$ 1,933		2,038
Non-compete agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Usesul life	1 year 3 months
Intangible Assets, Gross (Excluding Goodwill)	$ 200		200
Accumulated Amortization	149		139
Intangible Assets, Net	$ 51		$ 61

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- Definition

Finite-Lived and Indefinite-Lived Intangible Assets

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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.

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-Topic 230
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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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