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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2021
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, 2021 and 2020 is as follows:
Electronic MaterialsPerformance MaterialsTotal
Balance at September 30, 20191
$352,797 $357,274 $710,071 
Foreign currency translation impact7,628 (257)7,371 
Other— 1,205 1,205 
Balance at September 30, 20201
360,425 358,222 718,647 
Foreign currency translation impact1,848 1,573 3,421 
Additions due to acquisitions (See Note 4)
81,960 — 81,960 
Impairment— (227,126)(227,126)
Balance at September 30, 2021$444,233 $132,669 $576,902 
1.There are no accumulated impairment amounts at September 30, 2020 or 2019.
Components of Other Intangible Assets
The components of other intangible assets are as follows:
September 30, 2021September 30, 2020
Gross Carrying
Amount		Accumulated
Amortization		NetGross Carrying
Amount		Accumulated
Amortization		Net
Other intangible assets subject to amortization:
Customer relationships, trade names, and distribution rights$701,849 $207,606 $494,243 $690,716 $140,037 $550,679 
Product technology, trade secrets and know-how147,270 63,249 84,021 122,135 49,228 72,907 
Acquired patents and licenses8,748 8,748 — 8,921 8,713 208 
Total other intangible assets subject to amortization857,867 279,603 578,264 821,772 197,978 623,794 
Other intangible assets not subject to amortization:
Other indefinite-lived intangibles1
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$905,037 $279,603 $625,434 $868,942 $197,978 $670,964 
1.Other indefinite-lived intangibles not subject to amortization primarily consist of trade names.
Gross Carrying Amount
Balance at September 30, 2020
Additions1
Impairment2
FX and OtherBalance at September 30, 2021Accumulated AmortizationNet at September 30, 2021
Other intangible assets subject to amortization:
Customer relationships, trade names, and distribution rights$690,716 $11,800 $(2,419)$1,752 $701,849 $207,606 $494,243 
Product technology, trade secrets and know-how122,135 25,400 (583)318 147,270 63,249 84,021 
Acquired patents and licenses8,921 — (173)— 8,748 8,748 — 
Total other intangible assets subject to amortization821,772 37,200 (3,175)2,070 857,867 279,603 578,264 
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$868,942 $37,200 $(3,175)$2,070 $905,037 $279,603 $625,434 
1.Refer to Note 4 of this Annual Report on Form 10-K for additional information regarding the ITS acquisition.
2.Refer to Note 10 of this Annual Report on Form 10-K for additional information regarding the wood treatment impairment.
Components of Other Intangible Assets
The components of other intangible assets are as follows:
September 30, 2021September 30, 2020
Gross Carrying
Amount		Accumulated
Amortization		NetGross Carrying
Amount		Accumulated
Amortization		Net
Other intangible assets subject to amortization:
Customer relationships, trade names, and distribution rights$701,849 $207,606 $494,243 $690,716 $140,037 $550,679 
Product technology, trade secrets and know-how147,270 63,249 84,021 122,135 49,228 72,907 
Acquired patents and licenses8,748 8,748 — 8,921 8,713 208 
Total other intangible assets subject to amortization857,867 279,603 578,264 821,772 197,978 623,794 
Other intangible assets not subject to amortization:
Other indefinite-lived intangibles1
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$905,037 $279,603 $625,434 $868,942 $197,978 $670,964 
1.Other indefinite-lived intangibles not subject to amortization primarily consist of trade names.
Gross Carrying Amount
Balance at September 30, 2020
Additions1
Impairment2
FX and OtherBalance at September 30, 2021Accumulated AmortizationNet at September 30, 2021
Other intangible assets subject to amortization:
Customer relationships, trade names, and distribution rights$690,716 $11,800 $(2,419)$1,752 $701,849 $207,606 $494,243 
Product technology, trade secrets and know-how122,135 25,400 (583)318 147,270 63,249 84,021 
Acquired patents and licenses8,921 — (173)— 8,748 8,748 — 
Total other intangible assets subject to amortization821,772 37,200 (3,175)2,070 857,867 279,603 578,264 
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$868,942 $37,200 $(3,175)$2,070 $905,037 $279,603 $625,434 
1.Refer to Note 4 of this Annual Report on Form 10-K for additional information regarding the ITS acquisition.
2.Refer to Note 10 of this Annual Report on Form 10-K for additional information regarding the wood treatment impairment.
Estimated Future Amortization Expense Estimated future amortization expense of intangible assets as of September 30, 2021 for the five succeeding fiscal years is as follows:
Fiscal YearEstimated
Amortization
Expense
2022$78,566 
202366,716 
202459,440 
202554,251 
202649,568