Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2021	Oct. 03, 2020	Jul. 04, 2020	Apr. 04, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Income Statement [Abstract]
Net sales	$ 221,601	$ 238,033	$ 202,783	$ 220,204	$ 174,826	$ 197,823	$ 198,570	$ 173,737	$ 882,621	$ 744,956	$ 698,493
Cost of sales									561,297	484,588	455,025
Gross profit	78,798	86,936	74,463	81,127	56,163	69,995	72,940	61,270	321,324	260,368	243,468
Selling, general and administrative expenses									224,386	176,312	150,910
Impairment of trade name									8,000
Restructuring costs and charges									4,227
Gains on sales of assets											(2,551)
Income from operations									84,711	84,056	95,109
Interest expense, net									27,719	26,417	26,529
Debt extinguishment costs										1,512	3,375
Income before income taxes									56,992	56,127	65,205
Income tax expense									11,884	12,439	11,272
Net income	$ 9,987	$ 17,322	$ 2,199	$ 15,600	$ 3,280	$ 15,106	$ 17,045	$ 8,257	$ 45,108	$ 43,688	$ 53,933
Net income per common share:
Basic	$ 0.17	$ 0.29	$ 0.04	$ 0.27	$ 0.06	$ 0.26	$ 0.29	$ 0.14	$ 0.77	$ 0.75	$ 1.03
Diluted	$ 0.17	$ 0.29	$ 0.04	$ 0.26	$ 0.06	$ 0.26	$ 0.29	$ 0.14	$ 0.76	$ 0.74	$ 1.00
Weighted average shares outstanding:
Basic									58,887	58,346	52,461
Diluted									59,360	59,150	54,106