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Earnings per Share (Tables) | 12 Months Ended
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Sep. 30, 2023
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | 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,
| 2023 |  | 2022 |  | 2021
| 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. | $ | 119 |  |  | $ | 311 |  |  | $ | 149 |  |  | $ | 402 |  |  | $ | 68 |  |  | $ | 236 |
Less: Net income attributable to participating securities | (6) |  |  | — |  |  | (7) |  |  | — |  |  | (4) |  |  | — |
Net income attributable to common stockholders | $ | 113 |  |  | $ | 311 |  |  | $ | 142 |  |  | $ | 402 |  |  | $ | 64 |  |  | $ | 236 |
Denominator |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding | 138,070 |  |  | 377,650 |  |  | 133,662 |  |  | 381,046 |  |  | 110,561 |  |  | 402,912 |
Basic and Diluted EPS | $ | 0.82 |  |  | $ | 0.82 |  |  | $ | 1.06 |  |  | $ | 1.06 |  |  | $ | 0.58 |  |  | $ | 0.58 |

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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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