Number of Unvested Restricted Stock Unit Awards Outstanding (Detail) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Jan. 01, 2016		Jan. 02, 2015	Jan. 03, 2014
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Number of shares outstanding, awards balance	[1]	886,780
Number of shares outstanding, awards granted	[1]	331,191
Number of shares outstanding, awards vested	[1]	(428,878)
Number of shares outstanding, awards forfeited	[1]	(9,116)
Number of shares outstanding, awards balance	[1]	779,977		886,780
Number of shares outstanding, expected to vest	[1]	769,883
Weighted-average grant date fair value, awards balance	[1]	$ 26.40
Weighted-average grant date fair value, awards granted		43.76	[1]	$ 37.29	$ 27.09
Weighted-average grant date fair value, awards vested	[1]	29.72
Weighted-average grant date fair value, awards forfeited	[1]	32.25
Weighted-average grant date fair value, awards balance	[1]	31.88		$ 26.40
Weighted-average grant date fair value, expected to vest	[1]	$ 31.94
Weighted average remaining contractual term, Balance	[1]	1 year 6 months
Weighted average remaining contractual term, expected to vest	[1]	1 year 6 months
Aggregate intrinsic value, Balance	[1],[2]	$ 38,960
Aggregate intrinsic value, expected to vest	[1],[2]	$ 38,456

[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 1, 2016 was $49.95.