Organization and Summary of Significant Accounting Policies - Interest Expense, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest expense incurred primarily on the Senior Secured Notes	$ (23.6)	$ (23.5)	$ (21.6)
Miscellaneous interest income	0.8	1.9	0.8
Interest expense, net	$ (22.8)	$ (21.6)	$ (20.8)