Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Other Assets Consist Principally of Strategic Investments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Schedule of Investments [Line Items]
Other assets, net	$ 1,979	$ 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
ViaCyte, Inc. [Member]
Schedule of Investments [Line Items]
Other assets, net	479	479
Other [Member]
Schedule of Investments [Line Items]
Other assets, net		$ 2