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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) - Employee Stock Option - $ / shares
 6 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected term (in years)(1) [1]   4 years 4 years 2 months 23 days 4 years 4 months 6 days
Risk-free rate of return(2) [2]   2.00% 1.60% 1.50%
Expected volatility(3) [3]   18.30% 20.20% 21.70%
Expected dividend yield(4) [4]   0.70% 0.80% 0.70%
Fair value per option granted   $ 18.24 $ 13.90 $ 15.01
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility(3)       20.00%
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility(3)       23.00%
Visa        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected term peer weighted percentage 97.00%   87.00% 77.00%
Peer Companies        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected term peer weighted percentage 3.00%   13.00% 23.00%
[1] Until March 2018, this assumption was based on the Company’s historical option exercises and those of a set of peer companies that management believed to be generally comparable to Visa. The Company’s data was weighted based on the number of years between the measurement date and Visa’s IPO date as a percentage of the options’ contractual term. The relative weighting placed on Visa’s data and peer data for stock options granted until March 2018 in fiscal 2018 was approximately 97% and 3%, respectively, 87% and 13% in fiscal 2017, respectively, and 77% and 23% in fiscal 2016, respectively. The assumptions for stock options granted after March 2018 was based on Visa’s historical exercise experience as the passage of time since the Company’s IPO has exceeded 10 years.
[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 volatility was approximately 18% in fiscal 2018 and 20% in fiscal 2017 and ranged from 20% to 23% in fiscal 2016.
[4] Based on the Company’s annual dividend rate on the date of grant.