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Stock-Based Compensation (Narrative) (Detail) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Jun. 28, 2017
Jun. 29, 2016
Jun. 24, 2015
Employees And Non-Employee Directors And Consultants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for issuance 37.3    
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual term of stock option exercises, in years 8 years    
Unrecognized compensation expense $ 1.6    
Period of recognition for unrecognized stock-based compensation costs, in years 1 year 10 months 15 days    
Total intrinsic value of options exercised $ 5.6 $ 5.3 $ 28.1
Tax benefit realized on options exercised 1.6 1.6 9.2
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 9.4    
Period of recognition for unrecognized stock-based compensation costs, in years 2 years 2 months 10 days    
Fair value of shares that vested during period $ 12.8 $ 23.9 $ 34.2
Minimum [Member] | Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Maximum [Member] | Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years