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Goodwill (Tables)
 12 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill for the year ended September 30, 2018 are as follows (in thousands):
 
Solar
 
Semiconductor
 
Polishing
 
Total
   Goodwill
$
6,962

 
$
5,063

 
$
728

 
$
12,753

   Accumulated impairment losses
(1,348
)
 
—

 
—

 
(1,348
)
Balance at September 30, 2017
5,614

 
5,063

 
728

 
11,405

Impairment of goodwill
(5,663
)
 
—

 
—

 
(5,663
)
Net exchange differences
49

 
842

 
—

 
891

Balance at September 30, 2018
$
—

 
$
5,905

 
$
728

 
$
6,633

 
 
 
 
 
 
 
 
   Goodwill
$
6,836

 
$
5,905

 
$
728

 
$
13,469

   Accumulated impairment losses
(6,836
)
 
—

 
—

 
(6,836
)
Balance at September 30, 2018
$
—

 
$
5,905

 
$
728

 
$
6,633