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Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2023
Sep. 29, 2022
Sep. 28, 2023
Sep. 29, 2022
Dec. 29, 2022
NCM, LLC.          
Finite-Lived Intangible Assets [Line Items]          
Common membership units issued, net of returned 4,140,896        
Increase (decrease) in intangible assets, net $ 10.4        
Common membership units issued 6,483,893        
NCM, LLC. | AMC and Cinemark          
Finite-Lived Intangible Assets [Line Items]          
Increase (decrease) in intangible assets, net $ 0.9 $ 0.3 $ 2.1 $ 1.6  
Integration and other encumbered payments, related parties - financing activities $ 1.1 $ 1.2 $ 5.2 $ 2.6  
Regal          
Finite-Lived Intangible Assets [Line Items]          
Common membership units issued, net of returned 2,342,997        
AMC          
Finite-Lived Intangible Assets [Line Items]          
Common Membership Units Issued And Cancelled         16,581,829
Minimum | NCM, LLC.          
Finite-Lived Intangible Assets [Line Items]          
Percentage increase (decrease) in theater attendance for Common Unit adjustment to occur (2.00%)        
Maximum | NCM, LLC.          
Finite-Lived Intangible Assets [Line Items]          
Percentage increase (decrease) in theater attendance for Common Unit adjustment to occur 2.00%