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FCC Licenses - Discounted Cash Flow Analyses (Detail)
 3 Months Ended
Sep. 30, 2023
Jun. 30, 2022
Measurement Input, Discount Rate [Member]    
Fair Value Inputs Asset Quantitative Information [Line Items]    
Fair value assumptions inputs rate 10.00% 9.50%
Minimum [Member]    
Fair Value Inputs Asset Quantitative Information [Line Items]    
Market revenue shares at maturity 0.40% 0.60%
Operating income margins at maturity 19.70% 19.20%
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]    
Fair Value Inputs Asset Quantitative Information [Line Items]    
Fair value assumptions inputs rate (1.20%) (1.90%)
Maximum [Member]    
Fair Value Inputs Asset Quantitative Information [Line Items]    
Market revenue shares at maturity 44.70% 44.00%
Operating income margins at maturity 30.40% 32.60%
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]    
Fair Value Inputs Asset Quantitative Information [Line Items]    
Fair value assumptions inputs rate 1.80% 15.90%