Other Assets - Schedule of Other Assets Consist Principally of Strategic Investments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Schedule of Investments [Line Items]
Other assets, net	$ 3,166	$ 3,166
CeloNova BioSciences, Inc. [Member]
Schedule of Investments [Line Items]
Other assets, net	1,500	1,500
ThermopeutiX, Inc. [Member]
Schedule of Investments [Line Items]
Other assets, net	1,185	1,185
ViaCyte, Inc. [Member]
Schedule of Investments [Line Items]
Other assets, net	479	479
Other [Member]
Schedule of Investments [Line Items]
Other assets, net	$ 2	$ 2