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Related Parties Related Parties (Details) | 12 Months Ended
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Sep. 30, 2017 USD ($) entity | Sep. 30, 2016 USD ($) entity | Sep. 30, 2015 USD ($)
Related Party Transactions [Abstract] |  |  |
Minimum ownership of Visa stock to be considered a related party, percent | 10.00% |  |
Minimum ownership interest in investee to be considered a related party, percent | 10.00% |  |
Number of entities owning more than 10% of Visa's total voting stock | entity | 0 | 0 |
Significant transactions with related parties | $ | $ 0 | $ 0 | $ 0

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 + Details
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- References No definition available. + Details
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- Definition Minimum Ownership Interest in Investee for Related Party Status, Percent + References No definition available. + Details
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- Definition Minimum Ownership of Company Stock for Related Party Status, Percent + References No definition available. + Details
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- Definition Number of Entities Owning More Than 10% of Company Stock + References No definition available. + Details
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