Share-based Compensation - Additional Information (Detail)	6 Months Ended
Mar. 31, 2012
Share-based Compensation [Abstract]
Minimum number of performance shares granted to be earned during the performance period	0
Maximum number of performance shares granted to be earned during the performance period	132,227

Share based Compensation, Shares Authorized, Performance Target, Maximum

No definition available.

Name:	v_ShareBasedCompensationSharesAuthorizedPerformanceTargetMaximum
Namespace Prefix:	v_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration