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Subsequent Events - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) Employee Store | Jul. 29, 2018 USD ($) | Dec. 30, 2017 USD ($)
Subsequent Event [Line Items] |  |  |
Payments to acquire equity, net of cash acquired |  |  | $ 226,939,000
Martin’s Super Markets [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Payments to acquire equity, net of cash acquired | $ 84,300,000 |  |
Number of operating stores | Store | 21 |  |
Number of employees | Employee | 3,500 |  |
Minimum [Member] | Martin’s Super Markets [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Net sales |  | $ 450,000,000 |

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