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Business Segment Information (Tables)
 3 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Business Segment Information
Information concerning our business segments is as follows, in thousands:
 
Three Months Ended December 31,
 
 
2017
 
2016
 
Net Revenues:
 
 
 
 
Solar *
$
49,197

 
$
11,424

 
Semiconductor
20,891

 
15,703

 
Polishing
3,523

 
2,008

 
 
$
73,611

 
$
29,135

 
Operating income (loss):
 
 
 
 
Solar *
$
5,352

 
$
(1,023
)
 
Semiconductor
3,004

 
2,361

 
Polishing
1,104

 
464

 
Non-segment related
(1,694
)
 
(1,982
)
 
 
$
7,766

 
$
(180
)
 

* The financial statement of business units included in the Solar segment include some sales of equipment and parts to the semiconductor, silicon wafer and MEMS industries, comprising less than 25% of the Solar segment revenue.

 
December 31,
2017
 
September 30,
2017
Identifiable Assets:
 
 
 
Solar
$
76,794

 
$
97,999

Semiconductor
58,706

 
57,177

Polishing
5,912

 
5,078

Non-segment related
31,701

 
31,369

 
$
173,113

 
$
191,623