Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2021	Jun. 26, 2020	Jun. 25, 2021	Jun. 26, 2020
Income Statement [Abstract]
Net sales	$ 253,305	$ 189,119	$ 473,773	$ 361,730
Costs and expenses:
Cost of sales, exclusive of depreciation and amortization	152,140	109,243	281,016	209,633
Selling, general and administrative expenses	78,657	60,095	154,014	127,481
Depreciation and amortization	14,198	14,500	27,910	28,983
Total costs and expenses	244,995	183,838	462,940	366,097
Income (loss) from operations	8,310	5,281	10,833	(4,367)
Other expenses (income):
Interest expense	9,543	11,742	19,078	24,545
Other income	(296)	(2,217)	(509)	(1,334)
Total other expenses	9,247	9,525	18,569	23,211
Loss before income taxes	(937)	(4,244)	(7,736)	(27,578)
Income tax expense (benefit)	119	(1,015)	(644)	(5,331)
Net loss	(1,056)	(3,229)	(7,092)	(22,247)
Net loss attributable to noncontrolling interest	(12)	(16)	(34)	(40)
Net loss attributable to Company	$ (1,044)	$ (3,213)	$ (7,058)	$ (22,207)
Net loss per share, diluted (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.12)	$ (0.38)
Net loss per share, basic (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.12)	$ (0.38)
Weighted average shares outstanding, basic (in shares)	59,217,000	58,885,000	59,217,000	58,513,000
Weighted average shares outstanding, diluted (in shares)	59,217,000	58,885,000	59,217,000	58,513,000