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Commitments and Contingencies - Additional Information (Detail) $ in Millions, € in Billions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 21, 2016 EUR (€)
Other Commitments [Line Items] |  |  |  |
Rent expense incurred | $ | $ 159 | $ 134 | $ 136 |
Visa Europe |  |  |  |
Other Commitments [Line Items] |  |  |  |
Share capital of Visa Europe acquired (percent) |  |  |  | 100.00%
Contingent consideration | € |  |  |  | € 1.0
Accrued interest on contingent consideration |  |  |  | 4.00%
Minimum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Client Incentive Agreement Period | 1 year |  |  |
Maximum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Client Incentive Agreement Period | 16 years |  |  |

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- Details
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