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Visa Europe - Additional Information (Detail)
$ / shares in Units, € in Billions
 12 Months Ended
Nov. 02, 2015
EUR (€)
quarter
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Nov. 02, 2015
USD ($)
$ / shares
Oct. 19, 2015
day
$ / shares
Apr. 30, 2015
Class of Stock [Line Items]              
Share capital of Visa Europe acquired (percent)             100.00%
Maximum number of days within which the Company is required to purchase the shares of Visa Europe put option   285 days          
Visa Europe purchase price | $   $ 15,000,000,000          
Put option, fair value | $ [1]   $ 255,000,000 $ 145,000,000        
Probability of exercise by Visa Europe   40.00% 40.00%        
P/E differential at the time of exercise   150.00% 190.00%        
License fee (per year payable quarterly) | $   $ 143,000,000 $ 143,000,000 $ 143,000,000      
Subsequent Event | Visa Europe              
Class of Stock [Line Items]              
Share capital of Visa Europe acquired (percent) 100.00%       100.00%    
Total purchase price € 21.2            
Up-front cash consideration 11.5            
Consideration, preferred stock of the Company € 5.0            
Number of fiscal quarters included in contingent consideration period | quarter 16            
Contingent consideration € 4.0            
Accrued interest on contingent consideration € 0.7            
Euro-dollar exchange rate           1.12750  
Consecutive trading days used in calculation of average stock price and euro-dollar exchange rate | day           30  
Initial conversion rate of UK&I and Europe preferred stock into class A common or class A equivalent preferred stock 13.952            
Subsequent Event | Visa Europe | Class A equivalent preferred stock              
Class of Stock [Line Items]              
Preferred stock, par value | $ / shares         $ 0.0001    
Subsequent Event | Visa Europe | U.K.&I preferred stock              
Class of Stock [Line Items]              
Preferred stock, par value | $ / shares         0.0001    
Shares issued at closing (shares) | shares 2,480,500            
Value of shares issued at closing € 2.2            
Subsequent Event | Visa Europe | Europe preferred stock              
Class of Stock [Line Items]              
Preferred stock, par value | $ / shares         $ 0.0001    
Shares issued at closing (shares) | shares 3,157,000            
Value of shares issued at closing € 2.8            
Subsequent Event | Visa Europe | Class A common stock              
Class of Stock [Line Items]              
Average price of common stock (USD per share) | $ / shares           $ 71.68  
Loss Sharing Agreement | Subsequent Event | Visa Europe              
Class of Stock [Line Items]              
Loss sharing agreement | $         $ 1,000,000,000    
Conversion rate of U.K.&I preferred stock 0            
[1] the unamended put option was exercisable at any time at the sole discretion of Visa Europe with payment required 285 days thereafter. Classification in current liabilities reflects the fact that the obligation resulting from the exercise of the unamended instrument could become payable within 12 months at September 30, 2015. The fair value of the unamended put option does not represent the actual purchase price that the Company may be required to pay if the option is exercised in its unamended form, which would likely be in excess of $15 billion. During fiscal 2015, we recorded an increase of $110 million in the fair value of the unamended put option. See Note 2—Visa Europe.