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Acquisitions - Additional Information (Detail)
9 Months Ended
Dec. 31, 2018
USD ($)
Oct. 05, 2019
USD ($)
Employee
Store
Oct. 05, 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   $ 181,035,000 181,035,000 $ 178,648,000
Indefinite-lived intangible assets acquired     17,632,000  
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 $ 20,900,000      
Amortization of intangible assets, period 7 years      
Goodwill $ 0      
Merger/acquisition and integration costs   $ 1,200,000 $ 2,400,000  
Number of operating stores | Store   21 21  
Number of employees | Employee   3,500 3,500  
Martin's Super Markets [Member] | Trade Names [Member]        
Business Acquisition [Line Items]        
Indefinite-lived intangible assets acquired 17,600,000      
Martin's Super Markets [Member] | Customer Lists [Member]        
Business Acquisition [Line Items]        
Indefinite-lived intangible assets acquired $ 3,100,000