Annual report pursuant to Section 13 and 15(d)

Description of Business and Summary of Significant Accounting Policies (Details 3)

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Description of Business and Summary of Significant Accounting Policies (Details 3) - USD ($)
$ in Millions
 3 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2017
Oct. 01, 2017
Jul. 09, 2017
Dec. 25, 2016
Oct. 02, 2016
Jul. 10, 2016
Apr. 16, 2017
Apr. 17, 2016
Dec. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
Dec. 28, 2014
Dec. 29, 2013
Description of business and summary of significant accounting policies                          
Duration of fiscal period 91 days 84 days 84 days 84 days 84 days 84 days 112 days 112 days 371 days 364 days 364 days 364 days 364 days
Length of next fiscal year                 364 days        
Accounts Receivable                          
Gift cards in transit in accounts receivable $ 14.3     $ 12.4         $ 14.3 $ 12.4      
Tenant improvement allowances 2.2     3.8         2.2 3.8      
Inventories                          
Food and beverage inventories 9.0     9.8         9.0 9.8      
Supplies inventories $ 20.6     $ 20.1         $ 20.6 $ 20.1      
Minimum                          
Description of business and summary of significant accounting policies                          
Duration of fiscal period                 364 days        
Cash Equivalents                          
Period for conversion of amounts receivable from credit card issuers into cash                 2 days        
Maximum                          
Description of business and summary of significant accounting policies                          
Duration of fiscal period                 371 days        
Cash Equivalents                          
Period for conversion of amounts receivable from credit card issuers into cash                 4 days