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Intangible Assets and Goodwill - Summary of Methodology Used in Valuation of FCC Licenses (Details)
Oct. 01, 2021
Oct. 01, 2020
Discount Rate    
Goodwill And Other Intangibles [Line Items]    
FCC license valuation assumptions 12.10% 12.40%
Long-term Revenue Growth Rate    
Goodwill And Other Intangibles [Line Items]    
FCC license valuation assumptions 1.30% 1.00%
Mature Market Share    
Goodwill And Other Intangibles [Line Items]    
FCC license valuation assumptions 9.20% 9.40%
Operating Profit Margin | Minimum    
Goodwill And Other Intangibles [Line Items]    
FCC license valuation assumptions 24.20% 26.60%
Operating Profit Margin | Maximum    
Goodwill And Other Intangibles [Line Items]    
FCC license valuation assumptions 29.00% 29.50%