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The Company (Changes In Equity) (Details) - USD ($)
3 Months Ended
Mar. 30, 2023
Mar. 31, 2022
Accounting Policies [Abstract]    
Document Period End Date Mar. 30, 2023  
Net loss attributable to NCM, Inc. $ (45,500,000) $ (25,200,000)
NCM LLC equity issued for purchase of intangible asset 0 4,900,000
Income tax and other impacts of subsidiary ownership changes 27,500,000 (1,700,000)
Change from net loss attributable to NCM, Inc. and transfers from noncontrolling interests (18,400,000) $ (22,000,000.0)
Stock Issued During Period, Value, New Issues 10,300,000  
AdjustmentsToAdditionalPaidInCapitalInvestmentInSubsidiary $ (10,300,000)  
General Company Information [Line Items]    
Bankruptcy Proceedings Case Number Case No. 23-90291  
NCM, LLC.    
General Company Information [Line Items]    
General Unsecured Claim, Total Value $ 250,000  
Unsecured Convenience Claim, Maximum Value 2,500  
NCM Inc.    
General Company Information [Line Items]    
Secured Debt, Percentage of Ownership $ 100