Summary of the Allocation of the Accounting Purchase Consideration, Preliminary - PlaySpan (Parenthetical) (Detail) (Play Span Inc, USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2011 Year	Mar. 01, 2011
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Finite-lived intangible assets, weighted-average useful life (in years)	2.8
Technology Assets
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Tangible assets, net, technology		$ 56
Tangible assets, net, technology, weighted-average useful life (in years)	5

The amount of acquisition cost of a business combination allocated to noncurrent assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The calculated weighted-average useful life of all finite-lived intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275

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- Definition

The average useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]

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