Unvested Stock Options (Detail) (USD $)	12 Months Ended
	Jan. 03, 2014	Dec. 28, 2012	Dec. 30, 2011
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Unvested options Outstanding, Balance	84,254	103,878	136,000
Unvested Options Outstanding, Granted	27,500	25,000	30,000
Unvested Options Outstanding, Vested	(35,879)	(44,624)	(62,122)
Unvested Options Outstanding, Forfeited	0	0	0
Unvested Options Outstanding, Balance	75,875	84,254	103,878
Weighted Average Fair Value, Balance	$ 14.80	$ 12.58	$ 10.64
Weighted Average Fair Value, Granted	$ 18.78	$ 19.51	$ 16.51
Weighted Average Fair Value, Vested	$ 13.30	$ 12.27	$ 10.23
Weighted Average Fair Value, Forfeited	$ 0	$ 0	$ 0
Weighted Average Fair Value, Balance	$ 16.95	$ 14.80	$ 12.58