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Significant Accounting Policies and Estimates - Narratives (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jan. 27, 2018
Jan. 25, 2020
Jan. 26, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Capitalized Computer Software, Net   $ 21.2 $ 28.5
Composite Revenue, Percentage   15.00%  
Windstream      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounts Receivable, Gross, Noncurrent     $ 24.8
Revenue Recognized Using Cost To Cost Percentage of Completion Method [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of Revenue 5.00% 5.00% 5.00%
Equity Option [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years  
Restricted Stock Units (RSUs) [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years  
Performance Shares [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years  
Supplemental Shares      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years