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SEGMENT REPORTING (Tables)
 3 Months Ended
Dec. 31, 2018
SEGMENT REPORTING [Abstract]  
Segment Revenue
Revenue from external customers and segment adjusted EBITDA were (in thousands):

 
Three Months Ended
 
 
December 31,
 
 
2018
 
2017
 
Segment Revenue
      
Electronic Materials
 
$
190,617
  
$
133,314
 
Performance Materials
  
31,161
   
6,665
 
Total
 
$
221,778
  
$
139,979
 
Segment Adjusted EBITDA

  
Three Months Ended
 
  
December 31,
 
  
2018
  
2017
 
Segment adjusted EBITDA:
      
Electronic Materials
 
$
74,825
  
$
52,897
 
Performance Materials
  
13,067
   
1,288
 
Unallocated corporate expenses
  
(11,042
)
  
(10,852
)
Interest income
  
1,019
   
951
 
Interest expense
  
(6,890
)
  
(1,132
)
Depreciation and amortization
  
(16,541
)
  
(6,500
)
Charge for fair value write-up of acquired inventory sold
  
(10,261
)
  
-
 
Acquisition and integration related expenses
  
(27,294
)
  
-
 
Income before income taxes
 
$
16,883
  
$
36,652