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Commitments and Contingencies (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended 60 Months Ended 160 Months Ended
Jul. 01, 2021
Jun. 25, 2020
Jul. 01, 2021
Jun. 25, 2020
Oct. 31, 2022
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2027
Feb. 13, 2041
Dec. 31, 2020
Nov. 01, 2019
Other Commitments [Line Items]                      
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                
Weighted average remaining lease term 8 years 7 months 6 days   8 years 7 months 6 days                
Operating lease payments $ 1,100,000 $ 900,000 $ 2,000,000.0 $ 1,800,000              
Weighted average discount rate 7.35%   7.35%                
Maximum potential payment $ 107,600,000   $ 107,600,000                
Additional amount accrued related to minimum guarantees 100,000   100,000             $ 0.0  
Cinemark and Regal [Member]                      
Other Commitments [Line Items]                      
Platinum Spot Revenue Percentage                     25.00%
NCM, LLC. | Founding Members                      
Other Commitments [Line Items]                      
Liabilities recorded for related party obligations $ 0   $ 0             $ 0  
Percentage of increase in payment per theatre patron 8.00%                    
Term of increase in payment percentage per theater patron 5 years                    
Percentage of increase in payment per digital screen and digital cinema equipment 5.00%                    
Minimum                      
Other Commitments [Line Items]                      
Range of terms, in years 3 years                    
Minimum | NCM, LLC. | Founding Members                      
Other Commitments [Line Items]                      
Aggregate percentage of theater access fee paid 12.00%   12.00%                
Maximum                      
Other Commitments [Line Items]                      
Range of terms, in years 20 years                    
Future patron payment | Cinemark and Regal [Member]                      
Other Commitments [Line Items]                      
Amount Increase In Payment Per Theater Patron         $ 0.05 $ 0.0375 $ 0.025 $ 0.052 $ 0.08