Goodwill and Other Intangible Assets - Summary of Weighted Average Amortization Periods for Amortizable Intangible Assets (Detail)	12 Months Ended
	Dec. 28, 2019
Non-compete agreements [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	6 years 1 month 6 days
Pharmacy customer prescription lists [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	7 years 8 months 12 days
Customer relationships [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	16 years
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	7 years 1 month 6 days
Franchise fees and other [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	10 years 1 month 6 days