Unaudited Pro Forma Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 01, 2011	Jan. 02, 2010
Business Acquisition, Pro Forma Information [Line Items]
Net sales	$ 932,479	$ 862,351
Net earnings	$ 101,718	$ 87,120
Net earnings per share:
Basic	$ 5.65	$ 4.89
Diluted	$ 5.49	$ 4.70