Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 03, 2014		Dec. 28, 2012		Dec. 30, 2011
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Number of shares outstanding, Options Balance	258,128	[1]	435,396	[1]	511,140	[1]
Number of shares outstanding, Options Granted	27,500	[1]	25,000	[1]	30,000	[1]
Number of shares outstanding, Options Cancelled	0	[1]	(2,000)	[1]	0	[1]
Number of shares outstanding, Options Exercised	(68,628)	[1]	(200,268)	[1]	(105,744)	[1]
Number of shares outstanding, awards balance:	217,000	[1]	258,128	[1]	435,396	[1]
Number of shares outstanding, Vested and expected to vest	213,512	[1]
Number of shares outstanding, Exercisable	141,125	[1]
Weighted-average exercise price, Options Balance	$ 24.21	[1]	$ 17.60	[1]	$ 15.69	[1]
Weighted-average exercise price, Options Granted	$ 50.03	[1]	$ 48.27	[1]	$ 37.72	[1]
Weighted-average exercise price, Options Cancelled	$ 0	[1]	$ 6.50	[1]	$ 0	[1]
Weighted-average exercise price, Options Exercised	$ 9.76	[1]	$ 13.01	[1]	$ 14.07	[1]
Weighted-average exercise price, Options Balance	$ 32.06	[1]	$ 24.21	[1]	$ 17.60	[1]
Weighted-average exercise price, Options Vested and Expected to Vest	$ 31.95	[1]
Weighted-average exercise price, Exercisable	$ 26.81	[1]
Weighted average remaining contractual term, Balance	5 years 10 months 6 days	[1]
Weighted average remaining contractual term, Vested and Expected to Vest	5 years 9 months 29 days	[1]
Weighted average remaining contractual term, Exercisable	4 years 10 months 28 days	[1]
Aggregate intrinsic value, Balance	$ 9,835	[1]
Aggregate intrinsic value, Vested and Expected to Vest	9,700	[1]
Aggregate intrinsic value, Exercisable	$ 7,136	[1]

[1] Does not include restricted stock or employee stock purchase plans