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Retirement and Deferred Compensation Plans (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 25, 2017
Jun. 26, 2016
Jun. 28, 2015
Compensation and Retirement Disclosure [Abstract]      
Minimum employee 401K contribution (percent) 1.00%    
Maximum employee 401K contribution (percent) 75.00%    
Employer contribution matching (percent) 50.00%    
Maximum employee contributions matched by the Company (percent) 6.00%    
Defined benefit plan, contribution by employer $ 15.2 $ 13.2 $ 11.8
Payment of benefits, duration after opening of a deferral subaccount or upon retirement (at least) 3 years    
Deferred compensation plan maximum distribution period 20 years    
Liabilities of Company to plan participants $ 155.7 122.9  
Assets correlated to the deferred compensation obligation 180.2 149.8  
Defined benefit obligations $ 39.9 $ 37.0