Quarterly Data and Share Information (Unaudited) - Consolidated Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Nov. 17, 2020	Jan. 03, 2021	Oct. 04, 2020	Jul. 05, 2020	Apr. 05, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Quarterly Data and Share Information [Line Items]
Net sales		$ 276,947	$ 278,642	$ 259,504	$ 288,169	$ 339,482	$ 348,352	$ 357,507	$ 297,688	$ 1,103,262	$ 1,343,029	$ 1,179,573
Gross profit		96,807	102,162	97,294	114,311	137,971	137,744	140,730	116,522	410,574	532,967	429,883
Net income (loss)		$ 19,616	$ 5,913	$ 4,709	$ (102,167)	$ 16,432	$ 26,210	$ 29,499	$ 7,059	$ (71,929)	$ 79,200	$ 50,253
Basic income (loss) per share		$ 0.33	$ 0.10	$ 0.08	$ (1.75)	$ 0.28	$ 0.45	$ 0.50	$ 0.12	$ (1.23)	$ 1.34	$ 0.84
Diluted income (loss) per share		$ 0.33	$ 0.10	$ 0.08	$ (1.75)	$ 0.28	$ 0.45	$ 0.50	$ 0.12	$ (1.23)	$ 1.34	$ 0.84
Amortization of acquired intangible assets		$ 1,400	$ 1,400	$ 1,300	$ 1,300	$ 1,300	$ 1,300	$ 1,300	$ 1,900	$ 5,457	$ 5,903	$ 5,387
Restructuring and asset impairment charges						12,300	700
Goodwill and intangible asset impairment charge					121,300					121,258	0	0
Restructuring charges					(1,100)
Severance, Lease Exit and Asset Impairment Charges		3,200		8,800
Inventory Write-down				$ 4,200
Severance and Lease Exit Charges			5,800
Changes in unrecognized tax benefits										(14,962)	$ (3,324)	$ (1,010)
Securities and Exchange Commission (SEC) fine
Quarterly Data and Share Information [Line Items]
Litigation Settlement, Expense			$ 5,000							5,000
Discontinued Operations
Quarterly Data and Share Information [Line Items]
Changes in unrecognized tax benefits		(12,700)								(12,700)
Cost of Sales
Quarterly Data and Share Information [Line Items]
Prior Period Reclassification Adjustment						$ 2,300	$ 2,000	$ 2,100	$ 1,100
Interest Rate Swap
Quarterly Data and Share Information [Line Items]
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring		3,900								3,900
Syndicated Facility Agreement
Quarterly Data and Share Information [Line Items]
Loss on Extinguishment of Debt	$ 3,600	$ 3,600
Forfeiture of Share Based Compensation
Quarterly Data and Share Information [Line Items]
Adoption of new accounting standard - share-based payment awards					$ 1,400					$ 1,400
High
Quarterly Data and Share Information [Line Items]
Share prices (in dollars per share)		$ 10.53	$ 8.94	$ 11.04	$ 17.57	$ 17.68	$ 15.84	$ 17.22	$ 19.40	$ 10.53	$ 17.68
Low
Quarterly Data and Share Information [Line Items]
Share prices (in dollars per share)		$ 5.92	$ 5.88	$ 6.77	$ 5.06	$ 13.32	$ 10.37	$ 14.30	$ 13.87	$ 5.92	$ 13.32