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Earnings per Share (Tables) | 12 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share | The following table sets forth the calculation of basic and diluted net income per common share under the two-class method (in millions, except share amounts, which are reflected in thousands, and per share data):
| Fiscal Year Ended September 30,
| 2025 |  | 2024 |  | 2023
| Class A |  | Class B |  | Class A |  | Class B |  | Class A |  | Class B
Basic and Diluted EPS: |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Warner Music Group Corp. | $ | 105 |  |  | $ | 260 |  |  | $ | 122 |  |  | $ | 313 |  |  | $ | 119 |  |  | $ | 311 |
Less: Net income attributable to participating securities (a) | (4) |  |  | — |  |  | (6) |  |  | — |  |  | (6) |  |  | — |
Net income attributable to common stockholders | $ | 101 |  |  | $ | 260 |  |  | $ | 116 |  |  | $ | 313 |  |  | $ | 113 |  |  | $ | 311 |
Denominator |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding | 145,128 |  |  | 375,380 |  |  | 140,882 |  |  | 376,641 |  |  | 138,070 |  |  | 377,650 |
Basic and Diluted EPS (b) | $ | 0.69 |  |  | $ | 0.69 |  |  | $ | 0.83 |  |  | $ | 0.83 |  |  | $ | 0.82 |  |  | $ | 0.82 |
______________________________________ (a)Participating securities include unvested restricted stock units, which include the right to receive non-forfeitable dividend equivalents. Participating securities are not contractually obligated to share in losses. (b)For the fiscal year ended September 30, 2025, the weighted average shares outstanding for Diluted EPS includes the dilutive effect of approximately 397 shares. As the resulting Diluted EPS rounds to the same reported amount as Basic EPS, both Basic and Diluted EPS for the fiscal year ended September 30, 2025 are presented as $0.69 per share. There were no dilutive potentially issuable shares in the fiscal years ended September 30, 2024 and September 30, 2023.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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