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Income Taxes - Reconciliations of Income Taxes at Statutory Federal Income Tax Rate (Detail)
12 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Jun. 28, 2018
Jun. 29, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]          
Federal statutory income tax rate 21.00% 35.00% 28.10% 35.00% 35.00%
State income taxes, net of federal benefit     3.10% 3.30% 3.20%
Impact of Tax Reform     6.30%    
Research and development tax credit     (0.20%) (0.10%) (0.10%)
Domestic manufacturing deduction     (2.20%) (3.10%) (3.20%)
Windfall tax benefits     (1.00%) (1.80%)  
Uncertain tax positions     0.10% 0.10% (0.60%)
Other       (0.10%) 0.30%
Effective tax rate     34.20% 33.30% 34.60%