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Goodwill and Intangible Assets - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 26, 2019
Oct. 27, 2018
Jul. 28, 2018
Apr. 28, 2018
Jan. 27, 2018
Oct. 28, 2017
Jul. 29, 2017
Apr. 29, 2017
Jan. 28, 2017
Oct. 29, 2016
Jan. 27, 2018
Jan. 28, 2017
Jan. 26, 2019
Jul. 29, 2017
Jul. 30, 2016
Finite-Lived Intangible Assets [Line Items]                              
Goodwill $ 325,749       $ 321,743   $ 321,748       $ 321,743   $ 325,749 $ 321,748  
Amortization of intangible assets                     12,100   $ 22,600 24,800 $ 19,400
Change In Fair Value, Percentage                         25.00%    
Percentage Change in Fair Value Input                         10000.00%    
Revenues 748,619 $ 848,237 $ 799,470 $ 731,375 $ 655,133 $ 756,215 $ 780,188 $ 786,338 $ 701,131 $ 799,223 $ 1,411,348 $ 1,500,355 $ 3,127,700 $ 3,066,880 $ 2,672,542
Customer relationships                              
Finite-Lived Intangible Assets [Line Items]                              
Usesul life                         11 years 1 month 6 days    
Trade names                              
Finite-Lived Intangible Assets [Line Items]                              
Usesul life                         8 years    
Non-compete agreements                              
Finite-Lived Intangible Assets [Line Items]                              
Usesul life                         1 year 6 months    
Reporting Unit One [Member]                              
Finite-Lived Intangible Assets [Line Items]                              
Goodwill $ 5,700                       $ 5,700    
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 18.00%                       18.00%    
Reporting Unit Two                              
Finite-Lived Intangible Assets [Line Items]                              
Goodwill $ 10,100                       $ 10,100    
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 19.00%                       19.00%    
Sales Revenue, Services, Net [Member] | Windstream Corporation | Customer Concentration Risk [Member]                              
Finite-Lived Intangible Assets [Line Items]                              
Goodwill $ 13,200                       $ 13,200    
Revenues                         $ 113,600