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FCC Licenses - Discounted Cash Flow Analyses (Detail)
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Measurement Input, Discount Rate [Member]      
Fair Value Inputs Asset Quantitative Information [Line Items]      
Fair value assumptions inputs rate 9.00% 10.00% 10.00%
Minimum [Member]      
Fair Value Inputs Asset Quantitative Information [Line Items]      
Market revenue shares at maturity 0.40% 0.40% 0.40%
Operating income margins at maturity 19.70% 19.70% 19.70%
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]      
Fair Value Inputs Asset Quantitative Information [Line Items]      
Fair value assumptions inputs rate (10.70%) (16.50%) (1.20%)
Maximum [Member]      
Fair Value Inputs Asset Quantitative Information [Line Items]      
Market revenue shares at maturity 45.40% 45.50% 44.70%
Operating income margins at maturity 28.60% 29.90% 30.40%
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]      
Fair Value Inputs Asset Quantitative Information [Line Items]      
Fair value assumptions inputs rate 6.10% 24.40% 1.80%