Income Taxes - Reconciliation of Income Taxes at Statutory Tax Rate to Company's Effective Tax Rate (Detail)	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal taxes at statutory rate	21.00%	21.00%	35.00%
State taxes, net of federal tax benefit	1.30%	1.30%	3.40%
Research and development tax credit	(0.50%)	(0.40%)	(0.30%)
Federal permanent items	(0.30%)	(0.10%)	(0.40%)
Tax reform			2.50%
Effect of foreign operations	(1.10%)	(0.20%)	(0.10%)
Other	0.40%	0.30%	(0.50%)
Effective tax rate	20.80%	21.90%	39.60%