9.	Goodwill

Goodwill represents the excess of the cost of an acquired entity over the fair value assigned to the assets purchased and liabilities assumed in connection with a business acquisition. Goodwill is not amortized but is subject, at a minimum, to annual tests for impairment in accordance with accounting guidance for goodwill. The carrying amount of goodwill is evaluated annually, and between annual evaluations if events occur or circumstances change indicating that the carrying amount of goodwill may be impaired.

The $8.0 million of goodwill at March 31, 2015 and September 30, 2014 is related to the In Vitro Diagnostics reporting unit and represents the gross value from the acquisition of BioFX Laboratories, Inc. (“BioFX”) in 2007. The goodwill was not impaired based on the outcome of the fiscal 2014 annual impairment test, and there have been no events or circumstances that have occurred in the first six months of fiscal 2015 associated with the In Vitro Diagnostics reporting unit to indicate that the goodwill has been impaired.