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Acquisitions - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 31, 2018	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Business Acquisition [Line Items]
Payments to acquire certain assets and assume liabilities in cash			$ 86,659,000
Goodwill		$ 181,035,000	181,035,000
Indefinite-lived intangible assets acquired			20,631,000
Martin's Super Markets [Member]
Business Acquisition [Line Items]
Payments to acquire certain assets and assume liabilities in cash	$ 86,700,000
Business combination, cash acquired	7,800,000
Business combination, property and equipment acquired	55,000,000.0
Business combination, Intangible assets acquired	$ 23,900,000
Amortization of intangible assets, period	7 years
Goodwill	$ 0
Merger/acquisition and integration costs		$ 400,000	$ 1,300,000	$ 1,200,000
Martin's Super Markets [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired	20,600,000
Martin's Super Markets [Member] | Customer Lists [Member]
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired	$ 3,100,000

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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