Organization and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Allowance for Doubtful Accounts
Provisions	$ 0.0	$ (0.2)	$ 1.8
Allowance for Doubtful Accounts
Allowance for Doubtful Accounts
Balance at Beginning of Year	1.9	2.3	0.5
Provisions	0.0	(0.2)	1.8
Write-offs/Recoveries	(0.1)	(0.2)	0.0
Balance at End of Year	$ 1.8	$ 1.9	$ 2.3