Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Jan. 02, 2016		Oct. 03, 2015		Jul. 04, 2015		Apr. 04, 2015		Jan. 03, 2015		Sep. 27, 2014		Jun. 28, 2014		Mar. 29, 2014		Jan. 02, 2016	Jan. 03, 2015		Dec. 28, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 534,707		$ 449,004		$ 436,291		$ 406,596		$ 434,995		$ 404,289		$ 424,776		$ 372,478		$ 1,826,598	$ 1,636,538		$ 1,428,685
Gross Profit	198,872		177,182		172,889		157,562		169,055		162,380		166,174		142,976		706,505	640,585		550,011
Income from operations	72,633		80,030		83,360		66,580		82,295		86,465		75,739		55,933		302,603	300,432		244,462	[1]
Net earnings	$ 50,287		$ 48,825		$ 54,267		$ 38,231		$ 51,749		$ 59,713		$ 48,405		$ 33,445		$ 191,610	$ 193,312		$ 153,928
Basic earnings per share (usd per share)	$ 0.88	[2]	$ 0.86	[2]	$ 0.95	[2]	$ 0.67	[2]	$ 0.91	[2]	$ 1.05	[2]	$ 0.85	[2]	$ 0.59	[2]	$ 3.36	$ 3.41	[2]	$ 2.76
Diluted earnings per share (usd per share)	$ 0.88	[2]	$ 0.86	[2]	$ 0.95	[2]	$ 0.67	[2]	$ 0.91	[2]	$ 1.05	[2]	$ 0.85	[2]	$ 0.59	[2]	$ 3.36	$ 3.40	[2]	$ 2.74

[1] Non-operating expenses are not allocated to the reportable segments. Non-operating expenses consist of interest expense and deferred financing amortization, foreign exchange gains and losses and other income and expense items outside of income from operations.

[2] Sum of quarters may not equal the total for the year due to changes in the number of shares outstanding during the year.