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Business Segment Information
 6 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Business Segment Information
Business Segment Information
 
Our three reportable segments are as follows:

Solar – We are a leading supplier of thermal processing systems, including related automation, parts and services, to the solar/photovoltaic industry and also offer PECVD (plasma-enhanced chemical vapor deposition) equipment to the global solar market.

Semiconductor – We design, manufacture, sell and service thermal processing equipment and related controls for use by leading semiconductor manufacturers, and in electronics, automotive and other industries.

Polishing – We produce consumables and machinery for lapping (fine abrading) and polishing of materials, such as sapphire substrates, optical components, silicon wafers, numerous types of crystal materials, ceramics and metal components.

Information concerning our business segments is as follows, in thousands:
 
Three Months Ended March 31,
 
Six Months Ended March 31,
 
2018
 
2017
 
2018
 
2017
Net Revenues:
 
 
 
 
 
 
 
Solar *
$
12,598

 
$
16,555

 
$
61,795

 
$
27,979

Semiconductor
16,582

 
13,443

 
37,473

 
29,146

Polishing
3,603

 
2,946

 
7,126

 
4,954

 
$
32,783

 
$
32,944

 
$
106,394

 
$
62,079

Operating income (loss):
 
 
 
 
 
 
 
Solar *
$
(1,903
)
 
$
(1,878
)
 
$
3,449

 
$
(2,901
)
Semiconductor
2,257

 
1,403

 
5,261

 
3,763

Polishing
1,111

 
503

 
2,215

 
967

Non-segment related
(1,400
)
 
(1,428
)
 
(3,094
)
 
(3,412
)
 
$
65

 
$
(1,400
)
 
$
7,831

 
$
(1,583
)

* 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.

 
March 31,
2018
 
September 30,
2017
Identifiable Assets:
 
 
 
Solar
$
71,147

 
$
97,999

Semiconductor
59,761

 
57,177

Polishing
6,814

 
5,078

Non-segment related
33,295

 
31,369

 
$
171,017

 
$
191,623



Non-segment related assets include cash, property and other assets. We review our long-lived assets, including goodwill, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Additional information on impairment testing of long-lived assets, intangible assets and goodwill can be found in Note 1 of our Annual Report on Form 10-K, as amended, for the year ended September 30, 2017.