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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 28, 2019
Accounting Policies [Abstract]  
Revenue From External Customers By Products And Services
The following table summarizes financial information for each of our product groups.
 
 
Year Ended
 
 
December 28, 2019
 
December 29, 2018
 
December 30, 2017
Percentage of Sales, by Product Group
 
 
 
 
 
 
Parts and Batteries
 
67
%
 
66
%
 
65
%
Accessories and Chemicals
 
21
%
 
20
%
 
20
%
Engine Maintenance
 
11
%
 
13
%
 
14
%
Other
 
1
%
 
1
%
 
1
%
Total
 
100
%
 
100
%
 
100
%