Quarterly Data and Share Information (Unaudited) - Consolidated Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Quarterly Data and Share Information [Line Items]
Net sales	$ 339,482	$ 348,352	$ 357,507	$ 297,688	$ 337,059	$ 318,325	$ 283,626	$ 240,563	$ 1,343,029	$ 1,179,573	$ 996,443
Gross profit	135,704	135,762	138,590	115,398	121,682	99,945	109,148	93,582	525,454	424,357	386,021
Net income	$ 16,432	$ 26,210	$ 29,499	$ 7,059	$ 6,395	$ 8,172	$ 20,602	$ 15,084	$ 79,200	$ 50,253	$ 53,246
Basic income per share (in dollars per share)	$ 0.28	$ 0.45	$ 0.50	$ 0.12	$ 0.11	$ 0.14	$ 0.35	$ 0.25	$ 1.34	$ 0.84	$ 0.86
Diluted income per share (in dollars per share)	$ 0.28	$ 0.45	$ 0.50	$ 0.12	$ 0.11	$ 0.14	$ 0.35	0.25	1.34	0.84	$ 0.86
Purchase price accounting amortization	$ 1,300	$ 1,300	$ 1,300	$ 1,900	$ 11,800	$ 20,300
Restructuring and asset impairment charges	$ 12,300	$ 700			20,500
Transaction costs related to acquisition					1,200	$ 2,400	$ 5,800
Tax cuts and jobs act, income tax benefit					$ 6,700
High
Quarterly Data and Share Information [Line Items]
Share prices (in dollars per share)	$ 17.68	$ 15.84	$ 17.22	$ 19.40	$ 23.50	$ 24.50	$ 26.10	26.25	17.68	23.50
Low
Quarterly Data and Share Information [Line Items]
Share prices (in dollars per share)	$ 13.32	$ 10.37	$ 14.30	$ 13.87	$ 13.45	$ 21.70	$ 21.25	$ 22.10	$ 13.32	$ 13.45