The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Amount of potential cash payments that could result from the contingent consideration arrangement.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Share based Compensation Arrangement by Share based Payment Award, Options, Grants in Period, Fair Value

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Acquisitions - Additional Information (Detail) (USD $)		12 Months Ended		12 Months Ended		0 Months Ended	12 Months Ended
Acquisitions - Additional Information (Detail) (USD $)	Jul. 21, 2011	Sep. 30, 2012 Fudamo years	Jun. 09, 2011 Fudamo	Sep. 30, 2012 Pay Span Inc years	Mar. 02, 2011 Pay Span Inc	Jul. 21, 2010 CyberSource Corporation Acquisition years	Sep. 30, 2012 CyberSource Corporation Acquisition years	Sep. 30, 2010 CyberSource Corporation Acquisition	Jul. 21, 2011 CyberSource Corporation Acquisition	Jul. 21, 2011 CyberSource Corporation Acquisition Second Reporting Unit
Technology assets, weighted average useful lives (in years)		5		5		12	7
Purchase consideration			$ 110,000,000		$ 204,000,000				$ 1,952,000,000
Additional goodwill			80,000,000		141,000,000				1,239,000,000	800,000,000
Stock options, granted									1,600,000
Stock options, granted fair value									46,000,000
Vesting period from the date of grant							3
Acquisition-related costs								13,000,000
Earn-out provision	$ 0