Income Taxes - Reconciliation of Uncertain Tax Positions Excluding Accrued Interest (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Income Tax Disclosure [Abstract]
Gross uncertain tax positions at the beginning of the year	$ 2,633	$ 2,620	$ 2,630
Increase as a result of tax positions taken in the current period	687	547	498
Reduction as a result of the expiration of the applicable statute of limitations	(641)	(534)	(508)
Gross uncertain tax positions at the end of the year	$ 2,679	$ 2,633	$ 2,620