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Acquisitions - Additional Information (Detail)
4 Months Ended
Dec. 31, 2018
USD ($)
Apr. 20, 2019
USD ($)
Employee
Store
Apr. 20, 2019
USD ($)
Employee
Store
Dec. 29, 2018
USD ($)
Business Acquisition [Line Items]        
Payments to acquire certain assets and assume liabilities in cash   $ 86,659,000    
Goodwill   178,648,000 $ 178,648,000 $ 178,648,000
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      
Business combination, Intangible assets acquired $ 20,700,000      
Amortization of intangible assets, period 7 years      
Goodwill $ 0      
Merger/acquisition and integration costs   $ 2,100,000 $ 900,000  
Number of operating stores | Store   21 21  
Number of employees | Employee   3,500 3,500