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Stockholders' Equity - Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Details) shares in Millions | Jun. 30, 2025 shares | Sep. 30, 2024 shares
--- | --- | ---
Schedule of Common Stock as Converted [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 5 | 5
As-converted Class A Common Stock (in shares) | 1,945 | 1,983
Series A preferred stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 0 | 0
Preferred stock, conversion rate into Class A Common Stock | 100.0000 | 100.0000
As-converted Class A Common Stock (in shares) | 6 | 9
Series B preferred stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 2 | 2
Preferred stock, conversion rate into Class A Common Stock | 0.9960 | 1.0030
As-converted Class A Common Stock (in shares) | 2 | 2
Series C preferred stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 3 | 3
Preferred stock, conversion rate into Class A Common Stock | 1.7830 | 1.7860
As-converted Class A Common Stock (in shares) | 6 | 6
Class A common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 1,702 | 1,733
Common stock, conversion rate into Class A Common Stock | 0 | 0
As-converted Class A Common Stock (in shares) | 1,702 | 1,733
Class B-1 common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 5 | 5
Common stock, conversion rate into Class A Common Stock | 1.5609 | 1.5653
As-converted Class A Common Stock (in shares) | 8 | 8
Class B-2 common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 120 | 120
Common stock, conversion rate into Class A Common Stock | 1.5342 | 1.5430
As-converted Class A Common Stock (in shares) | 185 | 186
Class C common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 9 | 10
Common stock, conversion rate into Class A Common Stock | 4.0000 | 4.0000
As-converted Class A Common Stock (in shares) | 36 | 39

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