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Quarterly Financial Data (Unaudited) - Narratives (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Feb. 25, 2019
Jan. 27, 2018
Jan. 26, 2019
Jan. 28, 2018
Jul. 29, 2017
Jul. 30, 2016
Jul. 15, 2015
Interim Period, Costs Not Allocable [Line Items]              
Accounts Receivable, Net   $ 318,700 $ 625,258 $ 630,400      
Accounts Receivable, Net, Current   318,684 625,258 $ 630,400      
Bad debt expense, net   (38) $ 27        
Tax Cuts and Jobs Act of 2017, adjustment to income tax liability   32,200          
Tax benefit from exercise of stock options   $ 7,800          
7.125% Senior Subordinated Notes              
Interim Period, Costs Not Allocable [Line Items]              
Debt, interest rate (in percent)   7.125% 7.125%   7.125% 7.125% 7.125%
Windstream              
Interim Period, Costs Not Allocable [Line Items]              
Accounts Receivable, Net     $ 45,000        
Subsequent Event | Windstream              
Interim Period, Costs Not Allocable [Line Items]              
Bad debt expense, net $ 17,200