Estimated Useful Life of Property and Equipment (Detail)	12 Months Ended
Sep. 30, 2012
Data processing equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated Useful Life	3 years
Office furniture and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated Useful Life	3 years
Office furniture and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated Useful Life	7 years
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated Useful Life	Shorter of estimated useful life or lease term

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-URI http://asc.fasb.org/subtopic&trid=2155824

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration