Other Assets - Schedule of Other Assets Consist Principally of Strategic Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014
Schedule of Investments [Line Items]
Other assets, net	$ 1,979	$ 1,979
CeloNova BioSciences, Inc. [Member]
Schedule of Investments [Line Items]
Other assets, net	1,500	1,500
ViaCyte, Inc. [Member]
Schedule of Investments [Line Items]
Other assets, net	$ 479	$ 479

Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_OtherAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant