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Goodwill and Other Intangible Assets - Summary of Weighted Average Amortization Periods for Amortizable Intangible Assets (Detail)
12 Months Ended
Dec. 30, 2017
Non-compete agreements [Member]  
Finite Lived Intangible Assets [Line Items]  
Weighted Average Useful Life 6 years 3 months 18 days
Favorable leases [Member]  
Finite Lived Intangible Assets [Line Items]  
Weighted Average Useful Life 16 years 4 months 24 days
Pharmacy customer prescription lists [Member]  
Finite Lived Intangible Assets [Line Items]  
Weighted Average Useful Life 7 years 6 months
Customer relationships [Member]  
Finite Lived Intangible Assets [Line Items]  
Weighted Average Useful Life 16 years 1 month 6 days
Trade Names [Member]  
Finite Lived Intangible Assets [Line Items]  
Weighted Average Useful Life 7 years
Franchise fees and other [Member]  
Finite Lived Intangible Assets [Line Items]  
Weighted Average Useful Life 9 years 3 months 18 days