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GOODWILL AND OTHER INTANGIBLES
 12 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLES GOODWILL AND OTHER INTANGIBLES
Griffon had two reporting units at September 30, 2021 and three reporting units at September 30, 2020, which are our operating segments. The change in reporting units was a result of classifying the Defense Electronics segment as a discontinued operation as of September 30, 2021. Refer to Note 1, for additional information on the Company's Goodwill and Goodwill and indefinite-lived intangibles annual impairment testing.
 
The following table provides changes in carrying value of goodwill by segment through the year ended September 30, 2021:
 At September 30,
2019		Goodwill from acquisitions (a)Foreign currency translation adjustmentsAt September 30,
2020		Goodwill from acquisitions (a)Foreign currency translation adjustmentsAt September 30,
2021
Consumer and Professional Products$227,269 $4,451 $1,125 $232,845 $784 $1,266 $234,895 
Home and Building Products191,253 — — 191,253 — — 191,253 
Total$418,522 $4,451 $1,125 $424,098 $784 $1,266 $426,148 
(a) The increase in the CPP segment was due to the acquisitions of Apta in 2020 and Quatro in 2021.
The following table provides the gross carrying value and accumulated amortization for each major class of intangible asset:
 At September 30, 2021 At September 30, 2020
 Gross Carrying AmountAccumulated AmortizationAverage
Life
(Years)		Gross Carrying
Amount		Accumulated Amortization
Customer relationships & other$187,732 $75,794 23$184,699 $65,417 
Unpatented technology13,429 2,439 1313,503 2,633 
Total amortizable intangible assets201,161 78,233  198,202 68,050 
Trademarks227,097 —  224,050 — 
Total intangible assets$428,258 $78,233  $422,252 $68,050 
 
The gross carrying amount of intangible assets was impacted by $3,924 related to foreign currency translation.

Amortization expense for intangible assets subject to amortization was $9,561, $9,486 and $9,393 in 2021, 2020 and 2019, respectively. Amortization expense for each of the next five years and thereafter, based on current intangible balances and classifications, is estimated as follows: 2022 - $9,272; 2023 - $9,198; 2024 - $9,198; 2025 - $9,198 and 2026 - $9,198; thereafter - $76,864.