Note Receivable - Additional Information (Detail)	6 Months Ended
Mar. 31, 2013
Disclosure Note Receivable Additional Information [Abstract]
Interest rate on notes receivable	4.00%

Weighted average of stated interest rates of notes receivable.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 978

-SubTopic 310

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6498279&loc=d3e27327-108691

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