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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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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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