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Goodwill
 12 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill

The changes in the carrying amount of goodwill for the year ended September 30, 2017 are as follows.
 
Solar
 
Semiconductor
 
Polishing
 
Total
 
(dollars in thousands)
   Goodwill
$
6,597

 
$
5,063

 
$
728

 
$
12,388

   Accumulated impairment losses
(1,269
)
 
—

 
—

 
(1,269
)
Carrying value at September 30, 2016
5,328

 
5,063

 
728

 
11,119

Net exchange differences
286

 
—

 
—

 
286

Carrying value at September 30, 2017
$
5,614

 
$
5,063

 
$
728

 
$
11,405

 
 
 
 
 
 
 
 
   Goodwill
$
6,962

 
$
5,063

 
$
728

 
$
12,753

   Accumulated impairment losses
(1,348
)
 
—

 
—

 
(1,348
)
Carrying value at September 30, 2017
$
5,614

 
$
5,063

 
$
728

 
$
11,405



During 2017, we periodically assessed whether any indicators of impairment existed which would require us to perform an interim impairment review. As of each interim period end during the year, we concluded that a triggering event had not occurred that would more likely than not reduce the fair value of our reporting units below their carrying values. We performed our annual test of goodwill for impairment during the fourth quarter of 2017. The results of the first step of the goodwill impairment test indicated that the fair values of our reporting units were in excess of their respective carrying values, and thus we did not require an impairment charge.