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Loss Per Share (Narrative) (Details)
3 Months Ended 9 Months Ended
Aug. 03, 2023
$ / shares
shares
Sep. 28, 2023
$ / shares
shares
Sep. 29, 2022
shares
Sep. 28, 2023
$ / shares
shares
Sep. 29, 2022
shares
Aug. 02, 2023
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Common stock, par value (in usd per share) | $ / shares $ 0.01 $ 0.01   $ 0.01    
Common stock, shares outstanding (in shares) 17,411,323         174,112,385
Basic (in shares)   62,765,418 8,160,581 31,574,026 8,137,137  
Stockholders' Equity, Reverse Stock Split 1:10          
NCM, LLC.            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Basic (in shares)   0        
Stock Options And Non-Vested Restricted Stock            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Shares excluded from the calculation of diluted weighted average shares   983,825 727,533 983,825 727,533  
Common Units            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Shares excluded from the calculation of diluted weighted average shares     9,032,924   8,896,411  
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares       913,872    
Common Stock            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Stockholders' Equity Note, Stock Split, Conversion Ratio 0.1