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Summary of Significant Accounting Policies - Description and Fiscal Year (Details) - item
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Description of Business      
Number of broad areas of services 2    
Fiscal Year      
Number of weeks periodically contained in a fiscal year 53    
Number of weeks in a fiscal year 52 52 53