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Visa Europe - Additional Information (Detail) $ / shares in Units, $ in Millions, € in Billions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 21, 2016 EUR (€) shares | Jun. 21, 2016 EUR (€) | Jun. 21, 2016 EUR (€) debt_instrument | Jun. 21, 2016 EUR (€) | Jun. 21, 2016 USD ($) | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2015 USD ($) | Jun. 21, 2016 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Convertible participating preferred stock issued in Visa Europe acquisition | $ |  |  |  |  |  | $ 0 | $ 5,717 | $ 0 |
Average price of common stock (USD per share) |  |  |  |  |  |  |  |  | $ 77.33
Visa Europe |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Share capital of Visa Europe acquired (percent) | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  |  | 100.00%
Up-front cash consideration |  | € 12.2 |  |  | $ 13,900 |  |  |  |
Convertible participating preferred stock issued in Visa Europe acquisition |  | 5.3 |  |  | $ 6,100 |  |  |  |
Contingent consideration | € | € 1.0 | € 1.0 | € 1.0 | € 1.0 |  |  |  |  |
Accrued interest on contingent consideration | 4.00% | 4.00% | 4.00% | 4.00% |  |  |  |  | 4.00%
Number of convertible debt instruments issued |  |  | 3 | 3 |  |  |  |  |
Initial conversion rate of UK&I and Europe preferred stock into class A common or class A equivalent preferred stock | 13.952 | 13.952 | 13.952 | 13.952 |  |  |  |  | 13.952
Total purchase consideration | $ |  |  |  |  |  |  |  |  | $ 18,784
Visa Europe | Class A equivalent preferred stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  |  |  |  | $ 0.0001
Visa Europe | U.K.&I preferred stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued at closing (shares) | shares | 2,480,466 |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  |  |  |  | 0.0001
Visa Europe | Europe preferred stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued at closing (shares) | shares | 3,156,823 |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  |  |  |  | $ 0.0001
Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |
Preferred Stock | Visa Europe |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued at closing (shares) | shares | 79,000,000 |  |  |  |  |  |  |  |

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