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The Company (Narrative) (Details)
3 Months Ended 6 Months Ended 48 Months Ended
Jul. 01, 2021
USD ($)
Segment
shares
Jun. 25, 2020
USD ($)
shares
Jul. 01, 2021
USD ($)
shares
Jun. 25, 2020
USD ($)
shares
Feb. 07, 2041
Mar. 23, 2021
shares
Dec. 31, 2020
USD ($)
General Company Information [Line Items]              
Cumulative-effect adjustment for adoption of ASU 2014-09       $ 1,200,000      
2019 ESA Amendment Extension Period         4 years    
Remaining term (in years) 18 years 2 months 12 days            
Membership units exchangeable into common stock ratio 100.00%            
Number of reportable segment | Segment 1            
Number of shares of restricted stock and stock units vested | shares 281,810 33,378 1,125,539 557,681      
Operating lease, right-of-use asset $ 19,700,000   $ 19,700,000        
Short-term lease liability 2,000,000.0   2,000,000.0        
Long-term lease liability $ 21,600,000   $ 21,600,000        
Document Period End Date     Jul. 01, 2021        
customer ten percent of revenue 100.00% 100.00%   0.00%      
Contract with Customer, Liability, New Contract Liabilities     $ (2,900,000)        
Asset Impairment Charges $ 0 $ 1,700,000 $ 0.0 $ 1,700,000      
Customer Percentage of AR 10.00%   10.00%       10.10%
Common Membership Units Redeemed | shares           1,390,567  
Customer with revenue in excess of ten percent of Accounts Payable 0.00%   0.00%       100.00%
Share-based Payment Arrangement, Expense $ 200,000            
Percentage of Network Theaters Open 97.00%   97.00%        
NCM, LLC.              
General Company Information [Line Items]              
Weighted average term, esa and affiliate (in years) 15 years 10 months 24 days            
Common membership units outstanding | shares 166,427,095   166,427,095        
NCM, LLC. | Founding Members              
General Company Information [Line Items]              
Liabilities recorded for related party obligations $ 0   $ 0       $ 0
National Cine Media Inc [Member]              
General Company Information [Line Items]              
Common membership units outstanding | shares 80,238,751   80,238,751        
American Multi Cinema Inc [Member]              
General Company Information [Line Items]              
Common membership units outstanding | shares 0   0        
Cinemark              
General Company Information [Line Items]              
Common membership units outstanding | shares 43,161,550   43,161,550        
Regal Entertainment Group [Member]              
General Company Information [Line Items]              
Common membership units outstanding | shares 43,026,794   43,026,794        
Cinemark              
General Company Information [Line Items]              
Percentage of common membership units outstanding 25.90%            
Regal Entertainment Group [Member]              
General Company Information [Line Items]              
Percentage of common membership units outstanding 25.90%            
National Cine Media Inc [Member]              
General Company Information [Line Items]              
Percentage of common membership units outstanding 48.20%            
American Multi Cinema Inc [Member]              
General Company Information [Line Items]              
Percentage of common membership units outstanding 0.00%            
Revenue from Rights Concentration Risk [Member]              
General Company Information [Line Items]              
customer ten percent of revenue 14.10% 18.00% 11.30%