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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 27, 2019
Jul. 28, 2018
Jul. 27, 2019
Jul. 28, 2018
Jan. 26, 2019
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets $ 5,300 $ 5,800 $ 10,700 $ 11,500  
Intangible Assets, Gross (Excluding Goodwill) 327,267   327,267   $ 327,267
Accumulated Amortization 176,804   176,804   166,142
Intangible Assets, Net 150,463   150,463   161,125
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 10 years 7 months 6 days        
Intangible Assets, Gross (Excluding Goodwill) $ 312,017   312,017   312,017
Accumulated Amortization 168,124   168,124   157,691
Intangible Assets, Net $ 143,893   143,893   154,326
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 8,522   8,522   8,312
Intangible Assets, Net $ 1,828   1,828   2,038
Non-compete agreements          
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Usesul life 1 year        
Intangible Assets, Gross (Excluding Goodwill) $ 200   200   200
Accumulated Amortization 158   158   139
Intangible Assets, Net $ 42   $ 42   $ 61