Goodwill

The following table sets forth the changes in the carrying amount of goodwill by reporting unit for the year ended June 30, 2018:



	SMP		AMS		MDS		Total
Balance at June 30, 2017	$	116,003	$	217,956	$	46,887	$	380,846
Goodwill adjustment for the CES acquisition	291		—		—		291
Goodwill adjustment for the Delta acquisition	—		191		—		191
Goodwill arising from the RTL acquisition	3,266		—		—		3,266
Goodwill arising from the Themis acquisition	—		—		112,848		112,848
Balance at June 30, 2018	$	119,560	$	218,147	$	159,735	$	497,442

As defined by ASC 350, goodwill is tested for impairment on an interim basis at the occurrence of certain triggering events or at a minimum on an annual basis. In fiscal 2018, there were no triggering events which required an interim goodwill impairment test. The Company performed its annual goodwill impairment test in the fourth quarter of fiscal 2018 with no impairment noted.