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Concentration of Credit Risk - Additional Information (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 13, 2019 Store	Dec. 28, 2019 USD ($) Store Retailer	Dec. 29, 2018 USD ($)	Jan. 06, 2017 USD ($)
Concentration Of Credit Risk [Line Items]
Number of independent retailer for unearned advanced amount \| Retailer		1
Number of stores rights to acquire \| Store		5
Number of stores rights to acquire assigned to independent retailer \| Store	3
Number of stores acquired \| Store	2
Goodwill		$ 181,035	$ 178,648
Amount of charge related to realizability of customer advance		2,400	$ 32,000
Present value of potential obligation for sub-lease		7,700
Assigned sublease obligation		12,000
Food Distribution Segment [Member]
Concentration Of Credit Risk [Line Items]
Goodwill		$ 2,400		$ 46,300
Minimum [Member]
Concentration Of Credit Risk [Line Items]
Loan repayable period		5 years
Maximum [Member]
Concentration Of Credit Risk [Line Items]
Loan repayable period		10 years