XML 112 R89.htm IDEA: XBRL DOCUMENT v3.8.0.1
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
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years)(1) [1] 4 years 2 months 23 days 4 years 4 months 6 days 4 years 6 months 18 days
Risk-free rate of return(2) [2] 1.60% 1.50% 1.50%
Expected volatility(3) [3] 20.20% 21.70% 22.00%
Expected dividend yield(4) [4] 0.80% 0.70% 0.80%
Fair value per option granted $ 13.90 $ 15.01 $ 12.04
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility(3)   20.00% 21.00%
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility(3)   23.00% 23.00%
Visa      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term peer weighted percentage 87.00% 77.00% 67.00%
Peer Companies      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term peer weighted percentage 13.00% 23.00% 33.00%
[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 2017 was approximately 87% and 13%, respectively, and 77% and 23% in fiscal 2016, respectively and 67% and 33% in fiscal 2015, 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 volatility was 20% in fiscal 2017 and ranged from 20% to 23% in fiscal 2016 and 21% to 23% in fiscal 2015.
[4] Based on the Company’s annual dividend rate on the date of grant.