Other Assets Consist Principally of Strategic Investments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Schedule of Investments [Line Items]
Other assets, net	$ 3,030	$ 2,831
Investment in OctoPlus N.V.
Schedule of Investments [Line Items]
Other assets, net	999	718
Investment in Nexeon MedSystems, Inc.
Schedule of Investments [Line Items]
Other assets, net	285	285
Investment in ThermopeutiX, Inc.
Schedule of Investments [Line Items]
Other assets, net	1,185	1,185
Investment in ViaCyte, Inc.
Schedule of Investments [Line Items]
Other assets, net	559	559
Other
Schedule of Investments [Line Items]
Other assets, net	$ 2	$ 84