Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 30, 2017		Sep. 30, 2017		Jul. 01, 2017		Apr. 01, 2017		Dec. 31, 2016		Oct. 01, 2016		Jul. 02, 2016		Apr. 02, 2016		Dec. 30, 2017	Dec. 31, 2016		Jan. 02, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 632,859		$ 593,043		$ 579,343		$ 530,297		$ 596,817		$ 574,224		$ 580,456		$ 516,355		$ 2,335,542	$ 2,267,852		$ 1,826,598
Gross Profit	240,164		228,519		234,608		209,450		239,177		231,728		233,502		196,773		912,741	901,180		706,505
Income from operations	68,869		118,257		122,136		101,079		126,498		121,439		111,913		86,375		410,341	446,225		302,603	[1]
Net earnings	$ 75,186		$ 74,671		$ 77,569		$ 70,702		$ 80,936		$ 75,851		$ 72,891		$ 54,538		$ 298,128	$ 284,216		$ 191,610
Basic earnings per share (usd per share)	$ 1.35	[2]	$ 1.31	[2]	$ 1.35	[2]	$ 1.24	[2]	$ 1.42	[2]	$ 1.33	[2]	$ 1.28	[2]	$ 0.96	[2]		$ 4.98	[2]	$ 3.36
Diluted earnings per share (usd per share)	$ 1.35	[2]	$ 1.31	[2]	$ 1.35	[2]	$ 1.24	[2]	$ 1.41	[2]	$ 1.33	[2]	$ 1.28	[2]	$ 0.96	[2]	$ 5.26	$ 4.98	[2]	$ 3.36

[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.