Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 25, 2020	Jul. 31, 2021	Jul. 25, 2020	Jan. 30, 2021
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 4,700	$ 5,200	$ 9,400	$ 10,400
Intangible Assets, Gross (Excluding Goodwill)	327,067		327,067		$ 327,067
Accumulated Amortization	217,099		217,099		207,745
Intangible Assets, Net	109,968		109,968		119,322
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	8 years 10 months 24 days
Intangible Assets, Gross (Excluding Goodwill)	$ 312,017		312,017		312,017
Accumulated Amortization	207,798		207,798		198,604
Intangible Assets, Net	$ 104,219		104,219		113,413
Trade names
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Usesul life	8 years 3 months 18 days
Intangible Assets, Gross (Excluding Goodwill)	$ 10,350		10,350		10,350
Accumulated Amortization	9,301		9,301		9,141
Intangible Assets, Net	$ 1,049		$ 1,049		$ 1,209