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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 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 29.00% 2.00% 33.00% 24.00%  
U.S. Federal and State          
Income Taxes [Line Items]          
Estimated valuation allowance, determined to be reduced         $ 40
Non-cash income tax benefit       $ 37