Number of Unvested Restricted Stock Unit Awards Outstanding (Detail) (Restricted Stock [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 02, 2015		Jan. 03, 2014		Dec. 28, 2012
Restricted Stock [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Number of shares outstanding, awards granted	189,174	[1]
Number of shares outstanding, awards vested	(221,599)	[1]
Number of shares outstanding, awards forfeited	(2,532)	[1]
Number of shares outstanding, awards balance	443,390	[1]	478,347	[1]
Number of shares outstanding, expected to vest	437,319	[1]
Weighted-average grant date fair value awards granted	$ 74.58	[1]	$ 54.17		$ 48.04
Weighted-average grant date fair value awards vested	$ 48.29	[1]
Weighted-average grant date fair value awards forfeited	$ 59.07	[1]
Weighted-average grant date fair value awards balance	$ 52.81	[1]	$ 42.14	[1]
Weighted-average grant date fair value expected to vest	$ 52.75	[1]
Weighted average remaining contractual term, Balance	1 year 7 months 6 days	[1]
Weighted average remaining contractual term, expected to vest	1 year 6 months	[1]
Aggregate intrinsic value, Balance	$ 35,954	[1],[2]
Aggregate intrinsic value, expected to vest	$ 35,462	[1],[2]

[1] Does not include employee stock purchase plans or stock option plans.

[2] The intrinsic value is calculated as the market value as of the end of the fiscal period. As reported by the NASDAQ Global Select Market, the market value as of January 2, 2015 was $81.09.