Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 30, 2021	Jan. 25, 2020
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 327,067	$ 327,267
Accumulated Amortization	207,745	187,322
Intangible Assets, Net	119,322	139,945
UtiliQuest
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,700	4,700
Intangible Assets, Net	$ 4,700	4,700
Customer relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Lives (Years)	9 years 3 months 18 days
Gross Carrying Amount	$ 312,017	312,017
Accumulated Amortization	198,604	178,411
Intangible Assets, Net	$ 113,413	133,606
Trade names
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Lives (Years)	8 years 1 month 6 days
Gross Carrying Amount	$ 10,350	10,350
Accumulated Amortization	9,141	8,732
Intangible Assets, Net	1,209	1,618
Non-compete agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	200
Accumulated Amortization	0	179
Intangible Assets, Net	$ 0	$ 21