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Borrowings - Schedule of Outstanding Debt (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 27, 2024
Dec. 28, 2023
Debt Instrument [Line Items]    
Carrying value of long-term debt $ 10.0 $ 10.0
NCM, LLC.    
Debt Instrument [Line Items]    
Outstanding borrowings 10.0 10.0
Debt issuance costs, long-term 0.0 0.0
Long-term Debt 10.0 10.0
Carrying value of long-term debt 10.0 10.0
Less: current portion of debt 0.0 0.0
NCM, LLC. | Revolving Credit Facility 2023    
Debt Instrument [Line Items]    
Outstanding borrowings 10.0 $ 10.0
Long-term Debt $ 10.0  
Debt Instrument, Maturity Date Aug. 07, 2026