Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 28, 2012		Dec. 30, 2011		Dec. 31, 2010		Jan. 01, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options, Outstanding	258,128	[1]	435,396	[1]	511,140	[1]	817,109	[1]
Weighted average remaining contractual term, Balance	4 years 11 months 26 days	[1]
Weighted Average Exercise Price, Outstanding	$ 24.21	[1]	$ 17.60	[1]	$ 15.69	[1]	$ 11.74	[1]
Number of shares outstanding, Exercisable	173,874	[1]
Weighted-average exercise price, Exercisable	$ 19.39	[1]
Range Of Exercise Price $6.57-7.02
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options, Outstanding	42,000
Weighted average remaining contractual term, Balance	2 months 5 days
Weighted Average Exercise Price, Outstanding	$ 6.99
Number of shares outstanding, Exercisable	42,000
Weighted-average exercise price, Exercisable	$ 6.99
Range Of Exercise Price $12.02-15.65
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options, Outstanding	38,628
Weighted average remaining contractual term, Balance	2 years 2 months 23 days
Weighted Average Exercise Price, Outstanding	$ 13.59
Number of shares outstanding, Exercisable	30,628
Weighted-average exercise price, Exercisable	$ 13.90
Range Of Exercise Price $18.37-25.96
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options, Outstanding	92,500
Weighted average remaining contractual term, Balance	6 years 1 month 24 days
Weighted Average Exercise Price, Outstanding	$ 23.38
Number of shares outstanding, Exercisable	63,746
Weighted-average exercise price, Exercisable	$ 22.56
Range Of Exercise Price $31.01-$37.72
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options, Outstanding	60,000
Weighted average remaining contractual term, Balance	6 years 7 months 13 days
Weighted Average Exercise Price, Outstanding	$ 34.37
Number of shares outstanding, Exercisable	37,500
Weighted-average exercise price, Exercisable	$ 32.35
Range Of Exercise Price $48.27-48.27
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options, Outstanding	25,000
Weighted average remaining contractual term, Balance	9 years 1 month 13 days
Weighted Average Exercise Price, Outstanding	$ 48.27
Number of shares outstanding, Exercisable	0
Weighted-average exercise price, Exercisable	$ 0.00

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