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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 1 Months Ended 4 Months Ended 12 Months Ended
May 30, 2019
Store
Apr. 20, 2019
Store
Retailer
Employer
Dec. 29, 2018
USD ($)
Loss Contingencies [Line Items]      
Number of independent retailer for unearned advanced amount | Retailer   1  
Percent of unearned advanced amount to total assets   2.00%  
Amount of charge resulted in analysis of net realizability of the underlying collateral | $     $ 32.0
Number of stores rights to acquire   5  
Critical and declining zone fund status   Less than 65 percent  
Number of employers contributing to plan | Employer   1  
Minimum [Member]      
Loss Contingencies [Line Items]      
Projected insolvent period based on active to inactive participants ratio   15 years  
Maximum [Member]      
Loss Contingencies [Line Items]      
Status or critical and declining zone plans   65.00%  
Projected insolvent period based on active to inactive participants ratio   20 years  
Subsequent Event [Member]      
Loss Contingencies [Line Items]      
Number of stores rights to acquire assigned to independent retailer 3    
Number of stores acquired 2    
Number of stores acquired from independent retailer 3