CONSOLIDATED STATEMENTS OF NET INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Income Statement [Abstract]
Net sales	$ 1,445,695	$ 1,503,873	$ 1,718,468
Cost of sales	944,523	957,578	1,065,053
Gross profit	501,172	546,295	653,415
Selling, general, and administrative expenses	204,507	220,448	276,329
Research and development expenses	52,538	79,997	87,264
Amortization of intangibles	40,039	40,026	52,190
Restructuring, impairment, and other charges	41,716	13,033	12,583
Total operating expenses	338,800	353,504	428,366
Operating income	162,372	192,791	225,049
Interest expense	21,077	22,266	22,569
Foreign exchange (gain) loss	(14,875)	5,224	(863)
Other income, net	(5,083)	(583)	(1,599)
Income before income taxes	161,253	165,884	204,942
Income taxes	31,267	26,802	40,377
Net income	$ 129,986	$ 139,082	$ 164,565
Income per share:
Basic (in dollars per share)	$ 5.33	$ 5.66	$ 6.62
Diluted (in dollars per share)	$ 5.29	$ 5.60	$ 6.52
Weighted average shares and equivalent shares outstanding:
Basic (in shares)	24,371	24,576	24,870
Diluted (in shares)	24,592	24,818	25,235