Business and Credit Concentrations and Geographic Information (Details) - customer	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Sep. 28, 2019	Sep. 29, 2018	Dec. 28, 2019	Dec. 29, 2018
Net sales | Consolidated net sales | Top ten customers
Business and Credit Concentrations
Number of top customers			10	10
Percentage of concentration risk	59.50%	59.60%
Net sales | Consolidated net sales | Other than Walmart
Business and Credit Concentrations
Percentage of concentration risk	25.60%	24.80%
Accounts receivable | Consolidated net sales | Other than Walmart
Business and Credit Concentrations
Percentage of concentration risk	26.30%
Accounts receivable | Trade accounts receivables | Top ten customers
Business and Credit Concentrations
Number of top customers			10			10
Percentage of concentration risk	62.70%				62.30%
Accounts receivable | Trade accounts receivables | Other than Walmart
Business and Credit Concentrations
Percentage of concentration risk					29.10%
Accounts receivable | Trade accounts receivables | Kroger [Member]
Business and Credit Concentrations
Percentage of concentration risk	10.30%				7.80%
Foreign | Net sales | Consolidated net sales
Business and Credit Concentrations
Percentage of concentration risk	9.10%	7.70%