Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 29, 2019	Dec. 30, 2018	Dec. 08, 2020
Income Tax [Line Items]
Effective income tax rate	24.50%	45.80%	(14.10%)
Effective income tax rate with noncontrolling interest	25.50%	57.90%	(10.30%)
Uncertain tax positions	$ 2,600,000	$ 2,500,000
Uncertain tax positions that would affect income tax rate	2,600,000	2,500,000
Change in uncertain tax positions, expected material impact on consolidated financial statements	0
Valuation allowance for deferred tax assets	$ 5,325,000	$ 7,190,000
Piedmont Coca-Cola Bottling Partnership
Income Tax [Line Items]
Minority interest	22.70%			22.70%
Federal
Income Tax [Line Items]
Net operating losses	$ 0
State
Income Tax [Line Items]
Net operating losses	$ 33,800,000
Earliest Tax Year | Internal Revenue Service
Income Tax [Line Items]
Tax year open for examination	2007
Earliest Tax Year | State
Income Tax [Line Items]
Tax year open for examination	1998