Long-Term Debt (Details) $ in Millions	12 Months Ended
	Dec. 29, 2015 USD ($) item	Dec. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 22, 2015 USD ($)
Long-term debt
Maximum commitments				$ 200.0
Maximum commitments, letter of credit subfacility				50.0
Additional available credit				$ 100.0
Available borrowings	$ 180.0
Outstanding borrowings	0.0
Outstanding letters of credit	$ 20.0
Multiplier of rent used to compute Adjusted Debt | item	8
Threshold amount of unrestricted cash and cash equivalents above which amounts are netted against debt for calculation of net adjusted leverage ratio	$ 25.0
Trailing period for which EBITDAR is computed	12 months
Net Adjusted Leverage Ratio	2.5
EBITDAR Ratio	3.0
Capitalized interest expense	$ 1.6	$ 0.8	$ 0.7
Minimum
Long-term debt
Financial covenant, EBITDAR Ratio	1.9
Commitment fee (as a percent)	0.125%
Maximum
Long-term debt
Financial covenant, Net Adjusted Leverage Ratio	4.0
Commitment fee (as a percent)	0.25%
Adjusted LIBO Rate
Long-term debt
Credit facility, floating interest rate basis	Adjusted LIBO Rate
Adjusted LIBO Rate | Minimum
Long-term debt
Credit facility, basis spread on variable rate, (as a percent)	1.00%
Adjusted LIBO Rate | Maximum
Long-term debt
Credit facility, basis spread on variable rate, (as a percent)	1.75%
Federal Funds Effective Rate
Long-term debt
Credit facility, floating interest rate basis	Federal Funds Effective Rate
Credit facility, basis spread on variable rate, (as a percent)	0.50%
One-month Adjusted LIBO Rate
Long-term debt
Credit facility, floating interest rate basis	one-month Adjusted LIBO Rate
Fixed percentage added to variable rate	1.00%
One-month Adjusted LIBO Rate | Minimum
Long-term debt
Credit facility, basis spread on variable rate, (as a percent)	0.00%
One-month Adjusted LIBO Rate | Maximum
Long-term debt
Credit facility, basis spread on variable rate, (as a percent)	0.75%