D. Goodwill

The following table sets forth the changes in the carrying amount of goodwill for the six months ended December 31, 2012:


	ACS			MFS		Total
Balance at June 30, 2012	$	113,471		$	19,150	$	132,621
Goodwill arising from the Micronetics acquisition		46,509			—		46,509
Goodwill adjustment for the KOR acquisition		(701	)		—		(701	)

Balance at December 31, 2012	$	159,279		$	19,150	$	178,429

In the six months ended December 31, 2012, there were no triggering events, as defined by FASB ASC 350, which required an interim goodwill impairment test. The Company performs its annual goodwill impairment test in the fourth quarter of each fiscal year. The goodwill adjustment for the KOR acquisition is the result of changes in fair value estimates derived from additional information obtained during the measurement period which ended December 30, 2012.

The Company determines its reporting units in accordance with FASB ASC 350, by assessing whether discrete financial information is available and if management regularly reviews the operating results of that component. Following this assessment, the Company determined that its reporting units are the same as its operating segments, ACS and MFS.