Other Intangible Assets and Liabilities - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2017	Dec. 28, 2016	Dec. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 0.1	$ 0.1	$ 0.2
Favorable Leasehold Interest
Finite-Lived Intangible Assets [Line Items]
Intangible asset subject to amortization, weighted average amortization period	3 years
Unfavorable Leasehold Interest Liability
Finite-Lived Intangible Assets [Line Items]
Intangible asset subject to amortization, weighted average amortization period	4 years