Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Business and Significant Accounting Policies - Accounts Receivable and Inventories (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Concentration Risk [Line Items]
Credit loss on receivables	$ 0.6	$ 0.9	$ 0.8
Supplier concentration risk \| Contact Lenses \| Three Key Vendors
Concentration Risk [Line Items]
Concentration risk (percent)	92.00%
Supplier concentration risk \| Lenses \| One Key Vendor
Concentration Risk [Line Items]
Concentration risk (percent)	89.00%
Supplier concentration risk \| Frames \| Two Key Vendors
Concentration Risk [Line Items]
Concentration risk (percent)	60.00%