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Property and Equipment - Summary of Cost and Accumulated Depreciation Of Property and Equipment Under Capital Leases (Detail) - USD ($)
$ in Millions
Dec. 29, 2018
Dec. 30, 2017
Property, Plant and Equipment [Abstract]    
Buildings and improvements $ 21.8 $ 21.4
Accumulated depreciation (15.4) (14.0)
Net book value $ 6.4 $ 7.4