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Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Billions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2025 shares | Jul. 31, 2024 shares | May 31, 2024 shares | Sep. 30, 2025 USD ($) preferredStockSeries shares | Sep. 30, 2024 USD ($) shares | Sep. 30, 2023 USD ($) | Oct. 28, 2025 $ / shares | Apr. 30, 2025 USD ($) | Oct. 31, 2023 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ |  |  |  |  |  |  |  | $ 30.0 | $ 25.0
Stock repurchase plan, remaining authorized funds | $ |  |  |  | $ 24.9 |  |  |  |  |
Dividends declared and paid | $ |  |  |  | $ 4.6 | $ 4.2 | $ 3.8 |  |  |
Number of series of preferred stock acquired | preferredStockSeries |  |  |  | 3 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared, quarterly, per share amount (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.67 |  |
Series A convertible participating preferred stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued under equity plans (in shares) | 40,080 | 99,264 |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 4,000,000 | 4,000,000 |  |  |  |
Preferred stock, conversion rate |  |  |  | 100.0000 | 100.0000 |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 25,000,000 | 25,000,000 |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 2,000,000 | 2,000,000 |  |  |  |
Preferred stock, conversion rate |  |  |  | 0.6690 | 1.0030 |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 3,000,000 | 3,000,000 |  |  |  |
Preferred stock, conversion rate |  |  |  | 0.7640 | 1.7860 |  |  |  |
Class A common stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 2,000,000,000,000.0 |  |  |  |  |
Class B-1 common stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 499,000,000 |  |  |  |  |
Stock tendered during period, shares, stock exchange offer (in shares) |  |  | 241,000,000 |  |  |  |  |  |
Class B-2 common stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued under equity plans (in shares) |  |  | 120,000,000 |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 123,000,000 |  |  |  |  |
Common Class B-3 |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 61,000,000 |  |  |  |  |
Common Class B-4 |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 31,000,000 |  |  |  |  |
Common Class B-5 |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 15,000,000 |  |  |  |  |
Class C common stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued under equity plans (in shares) |  |  | 48,000,000 |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 1,100,000,000 |  |  |  |  |
Class A equivalent preferred stock | Visa Europe |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, conversion rate |  |  |  | 100 |  |  |  |  |

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