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Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]  
Segment Reporting Revenue Percentage

The following table shows the relative size of the revenue recognized in each of the Company’s reportable segments:

 

 

 

Years Ended September 30

 

 

 

2017

 

 

2016

 

 

2015

 

Reinforcement Materials

 

 

53

%

 

 

48

%

 

 

54

%

Performance Chemicals

 

 

35

%

 

 

37

%

 

 

33

%

Purification Solutions

 

 

11

%

 

 

13

%

 

 

11

%

Specialty Fluids

 

 

1

%

 

 

2

%

 

 

2

%