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FCC Licenses - Discounted Cash Flow Analyses (Detail)
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Measurement Input, Discount Rate [Member]    
Fair Value Inputs Asset Quantitative Information [Line Items]    
Fair value assumptions inputs rate 12.00% 9.00%
Minimum [Member]    
Fair Value Inputs Asset Quantitative Information [Line Items]    
Market revenue shares at maturity 15.20% 0.40%
Operating income margins at maturity 12.00% 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 (9.00%) (10.70%)
Maximum [Member]    
Fair Value Inputs Asset Quantitative Information [Line Items]    
Market revenue shares at maturity 45.80% 45.40%
Operating income margins at maturity 23.30% 28.60%
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]    
Fair Value Inputs Asset Quantitative Information [Line Items]    
Fair value assumptions inputs rate 3.50% 6.10%