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Assumptions Used to Estimate the Fair Value of Each Stock Option on the Date of Grant Using a Black-Scholes Option Pricing Model (Detail) - $ / shares

12 Months Ended

Sep. 30, 2016

Sep. 30, 2015

Sep. 30, 2014

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Expected term (in years)(1)

^[1]

4 years 4 months 6 days

4 years 6 months 18 days

4 years 9 months 18 days

Risk-free rate of return(2)

^[2]

1.50%

1.50%

1.30%

Expected volatility(3)

^[3]

21.70%

22.00%

25.20%

Expected dividend yield(4)

^[4]

0.70%

0.80%

0.80%

Fair value per option granted

$ 15.01

$ 12.04

$ 11.03

Minimum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Expected volatility(3)

20.00%

21.00%

22.00%

Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Expected volatility(3)

23.00%

23.00%

26.00%

Visa

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Expected term peer weighted percentage

77.00%

67.00%

58.00%

Peer Companies

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Expected term peer weighted percentage

23.00%

33.00%

42.00%

[1]	This assumption is based on the Company's historical option exercises and those of a set of peer companies that management believes is generally comparable to Visa. The Company's data is weighted based on the number of years between the measurement date and Visa's initial public offering as a percentage of the options' contractual term. The relative weighting placed on Visa's data and peer data in fiscal 2016 was approximately 77% and 23%, respectively, 67% and 33% in fiscal 2015, respectively, and 58% and 42% in fiscal 2014, respectively.
[2]	Based upon the zero coupon U.S. treasury bond rate over the expected term of the awards.
[3]	Based on the Company’s implied and historical volatility. The expected volatilities ranged from 20% to 23% in fiscal 2016, 21% to 23% in fiscal 2015, and 22% to 26% in fiscal 2014.
[4]	Based on the Company’s annual dividend rate on the date of grant.

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term Peer Weighted Percentage

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