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RECONSOLIDATION OF NCM LLC - Narratives (Details)
3 Months Ended 12 Months Ended
Aug. 07, 2023
USD ($)
$ / shares
shares
Mar. 28, 2024
USD ($)
segment
shares
Mar. 30, 2023
USD ($)
shares
Dec. 28, 2023
Aug. 06, 2023
USD ($)
Business Acquisition          
Number of reportable segment | segment   1      
Stock Issued During Period, Shares, New Issues | shares     4,369,080    
REVENUE (including revenue from related parties of $0.0, and $3.3, respectively)   $ 37,400,000 $ 34,900,000    
Net loss attributable to NCM, Inc.   (34,700,000) $ (45,500,000)    
Business Combination, Bargain Purchase, Gain Recognized, Amount   167,800,000      
Deconsolidation, Gain (Loss), Amount   $ (557,700,000)      
Series B Preferred Stock          
Business Acquisition          
Stock Issued During Period, Shares, New Issues | shares   50,000,000      
Secured Creditors          
Business Acquisition          
Share Price | $ / shares $ 2.94        
Stock Issued During Period, Shares, New Issues | shares 83,421,135        
Stock Issued $ 245,300,000        
NCM, LLC.          
Business Acquisition          
Payments to Acquire Additional Interest in Subsidiaries 15,000,000        
Repayments of Unsecured Debt $ 500,000        
Equity Interest Acquired, Percentage 2.80%        
Investment Owned, at Cost         $ 11,900,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain   $ (35,500,000)      
NCM Inc.          
Business Acquisition          
Percentage of common membership units outstanding       10000.00%  
Transfers Related To Bankruptcy Settlement          
Business Acquisition          
Related Party Transaction, Amounts of Transaction $ 15.5 $ 15