Investments in Unconsolidated Companies - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated companies accounted for under the equity method	$ 5,700,000	$ 1,600,000
Sales to related party	700,000	300,000
Purchases from unconsolidated companies	8,900,000	9,300,000	$ 9,500,000
Dividends from unconsolidated subsidiaries	0	0	0
Unconsolidated companies
Schedule of Equity Method Investments [Line Items]
Purchases from unconsolidated companies	0	$ 0	$ 0
Purple Carrot
Schedule of Equity Method Investments [Line Items]
Sales to related party	$ 500,000