Document And Entity Information - USD ($)
12 Months Ended
Dec. 26, 2019
Jun. 27, 2019
Feb. 18, 2019
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 26, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol NCMI    
Entity Registrant Name National CineMedia, Inc.    
Entity Central Index Key 0001377630    
Entity Filer Category Accelerated Filer    
Current Fiscal Year End Date --12-26    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float   $ 328,535,741  
Entity Common Stock, Shares Outstanding     79,751,489