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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 12 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill activity
Goodwill activity for each of the Company’s reportable segments for the years ended September 30, 2020 and 2019 is shown below:

Electronic MaterialsPerformance MaterialsTotal
Balance at September 30, 2018$96,083 $5,000 $101,083 
Foreign currency translation impact(3,145)4 (3,141)
Goodwill arising from the Acquisition259,859 352,270 612,129 
Balance at September 30, 2019$352,797 $357,274 $710,071 
Foreign currency translation impact7,628 (257)7,371 
Other— 1,205 1,205 
Balance at September 30, 2020$360,425 $358,222 $718,647 
Components of other intangible assets
The components of other intangible assets are as follows:

September 30, 2020September 30, 2019
Gross Carrying
Amount		Accumulated
Amortization		NetGross Carrying
Amount		Accumulated
Amortization		Net
Other intangible assets subject to amortization:
Customer relationships, trade names, and distribution rights$690,716 $140,037 $550,679 $684,764 $64,471 $620,293 
Product technology, trade secrets and know-how122,135 49,228 72,907 123,948 37,993 85,955 
Acquired patents and licenses8,921 8,713 208 9,023 8,397 626 
Total other intangible assets subject to amortization821,772 197,978 623,794 817,735 110,861 706,874 
Other intangible assets not subject to amortization:
Other indefinite-lived intangibles*47,170 — 47,170 47,170 — 47,170 
Total other intangible assets not subject to amortization47,170 — 47,170 47,170 — 47,170 
Total other intangible assets$868,942 $197,978 $670,964 $864,905 $110,861 $754,044 
*Other indefinite-lived intangibles not subject to amortization primarily consist of trade names.
Gross Carrying Amount
Balance at September 30, 2019
Impairment1
FX and OtherBalance at September 30, 2020Accumulated AmortizationNet at September 30, 2020
Other intangible assets subject to amortization:
Customer relationships, trade names, and distribution rights$684,764 $(1,419)$7,371 $690,716 $140,037 $550,679 
Product technology, trade secrets and know-how123,948 (343)(1,470)122,135 49,228 72,907 
Acquired patents and licenses9,023 (102)— 8,921 8,713 208 
Total other intangible assets subject to amortization817,735 (1,864)5,901 821,772 197,978 623,794 
Other intangible assets not subject to amortization:
Other indefinite-lived intangibles*47,170 — — 47,170 — 47,170 
Total other intangible assets not subject to amortization47,170 — — 47,170 — 47,170 
Total other intangible assets$864,905 $(1,864)$5,901 $868,942 $197,978 $670,964 
Components of other intangible assets
The components of other intangible assets are as follows:

September 30, 2020September 30, 2019
Gross Carrying
Amount		Accumulated
Amortization		NetGross Carrying
Amount		Accumulated
Amortization		Net
Other intangible assets subject to amortization:
Customer relationships, trade names, and distribution rights$690,716 $140,037 $550,679 $684,764 $64,471 $620,293 
Product technology, trade secrets and know-how122,135 49,228 72,907 123,948 37,993 85,955 
Acquired patents and licenses8,921 8,713 208 9,023 8,397 626 
Total other intangible assets subject to amortization821,772 197,978 623,794 817,735 110,861 706,874 
Other intangible assets not subject to amortization:
Other indefinite-lived intangibles*47,170 — 47,170 47,170 — 47,170 
Total other intangible assets not subject to amortization47,170 — 47,170 47,170 — 47,170 
Total other intangible assets$868,942 $197,978 $670,964 $864,905 $110,861 $754,044 
*Other indefinite-lived intangibles not subject to amortization primarily consist of trade names.
Gross Carrying Amount
Balance at September 30, 2019
Impairment1
FX and OtherBalance at September 30, 2020Accumulated AmortizationNet at September 30, 2020
Other intangible assets subject to amortization:
Customer relationships, trade names, and distribution rights$684,764 $(1,419)$7,371 $690,716 $140,037 $550,679 
Product technology, trade secrets and know-how123,948 (343)(1,470)122,135 49,228 72,907 
Acquired patents and licenses9,023 (102)— 8,921 8,713 208 
Total other intangible assets subject to amortization817,735 (1,864)5,901 821,772 197,978 623,794 
Other intangible assets not subject to amortization:
Other indefinite-lived intangibles*47,170 — — 47,170 — 47,170 
Total other intangible assets not subject to amortization47,170 — — 47,170 — 47,170 
Total other intangible assets$864,905 $(1,864)$5,901 $868,942 $197,978 $670,964 
Estimated future amortization expense Estimated future amortization expense of intangible assets as of September 30, 2020 for the five succeeding fiscal years is as follows:
Fiscal YearEstimated
Amortization
Expense
2021$81,985
202274,695
202362,879
202455,664
202550,526