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Goodwill (Tables)
 12 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of 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