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FCC Licenses - Discounted Cash Flow Analyses (Detail) | 3 Months Ended
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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%

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