Goodwill

The following table sets forth the changes in the carrying amount of goodwill by reporting unit for the six months ended December 31, 2017:



	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	—		201		—		201
Goodwill arising from the RTL acquisition	3,447		—		—		3,447
Balance at December 31, 2017	$	119,741	$	218,157	$	46,887	$	384,785

In the six months ended December 31, 2017, there were no triggering events, as defined by FASB ASC 350, Intangibles - Goodwill and Other, which required an interim goodwill impairment test. The Company performs its annual goodwill impairment test in the fourth quarter of each fiscal year.