Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2016		Oct. 01, 2016		Jul. 02, 2016		Apr. 02, 2016		Jan. 02, 2016		Oct. 03, 2015		Jul. 04, 2015		Apr. 04, 2015		Dec. 31, 2016	Jan. 02, 2016		Jan. 03, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 596,817		$ 574,224		$ 580,456		$ 516,355		$ 534,707		$ 449,004		$ 436,291		$ 406,596		$ 2,267,852	$ 1,826,598		$ 1,636,538
Gross Profit	239,177		231,728		233,502		196,773		198,872		177,182		172,889		157,562		901,180	706,505		640,585
Income from operations	126,498		121,439		111,913		86,375		72,633		80,030		83,360		66,580		446,225	302,603		300,432	[1]
Net earnings	$ 80,936		$ 75,851		$ 72,891		$ 54,538		$ 50,287		$ 48,825		$ 54,267		$ 38,231		$ 284,216	$ 191,610		$ 193,312
Basic earnings per share (usd per share)	$ 1.42	[2]	$ 1.33	[2]	$ 1.28	[2]	$ 0.96	[2]	$ 0.88	[2]	$ 0.86	[2]	$ 0.95	[2]	$ 0.67	[2]	$ 4.98	$ 3.36	[2]	$ 3.41
Diluted earnings per share (usd per share)	$ 1.41	[2]	$ 1.33	[2]	$ 1.28	[2]	$ 0.96	[2]	$ 0.88	[2]	$ 0.86	[2]	$ 0.95	[2]	$ 0.67	[2]	$ 4.98	$ 3.36	[2]	$ 3.40

[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.