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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Sep. 30, 2017
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Income Taxes [Line Items]            
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 21.00%     21.00%    
Effective tax rate 32.00%   40.00% 37.00% 39.00%  
U.S. Federal and State            
Income Taxes [Line Items]            
Estimated valuation allowance, determined to be reduced           $ 40
Non-cash income tax benefit   $ 37