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Stockholders' Equity - Schedule of Stock by Class (Details) shares in Millions | Mar. 31, 2026 shares | Sep. 30, 2025 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) | 1,894 | 1,930
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) | 7 | 8
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 | 0.5960 | 0.6690
As-converted Class A Common Stock (in shares) | 1 | 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 | 0.7170 | 0.7640
As-converted Class A Common Stock (in shares) | 2 | 2
Class A common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 1,660 | 1,691
Common stock, conversion rate into Class A Common Stock | 0 | 0
As-converted Class A Common Stock (in shares) | 1,660 | 1,691
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 | 1.5475 | 1.5549
As-converted Class A Common Stock (in shares) | 7 | 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 | 1.5075 | 1.5223
As-converted Class A Common Stock (in shares) | 181 | 183
Class C common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 9 | 9
Common stock, conversion rate into Class A Common Stock | 4.0000 | 4.0000
As-converted Class A Common Stock (in shares) | 36 | 36

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