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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 28, 2018
Jul. 29, 2017
Jul. 28, 2018
Jul. 29, 2017
Jan. 27, 2018
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets $ 5,800 $ 6,300 $ 11,500 $ 12,500  
Intangible Assets, Gross (Excluding Goodwill) 327,267   327,267   $ 315,217
Accumulated Amortization 154,962   154,962   143,748
Intangible Assets, Net 172,305   172,305   171,469
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 11 years 6 months        
Intangible Assets, Gross (Excluding Goodwill) $ 312,017   312,017   299,717
Accumulated Amortization 146,740   146,740   135,544
Intangible Assets, Net $ 165,277   165,277   164,173
Trade names          
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Usesul life 8 years 2 months 12 days        
Intangible Assets, Gross (Excluding Goodwill) $ 10,350   10,350   10,350
Accumulated Amortization 8,103   8,103   7,872
Intangible Assets, Net $ 2,247   2,247   2,478
Non-compete agreements          
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Usesul life 2 years        
Intangible Assets, Gross (Excluding Goodwill) $ 200   200   450
Accumulated Amortization 119   119   332
Intangible Assets, Net $ 81   $ 81   $ 118