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GOODWILL AND OTHER INTANGIBLES | 12 Months Ended
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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 adjustments |  | At September 30, 2020 |  | Goodwill from acquisitions (a) |  |  |  | Foreign currency translation adjustments |  | At September 30, 2021
Consumer and Professional Products | $ | 227,269 |  |  | $ | 4,451 |  |  |  |  | $ | 1,125 |  |  | $ | 232,845 |  |  | $ | 784 |  |  |  |  | $ | 1,266 |  |  | $ | 234,895 |
Home and Building Products | 191,253 |  |  | — |  |  |  |  | — |  |  | 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 Amount |  | Accumulated Amortization |  | Average Life (Years) |  | Gross Carrying Amount |  | Accumulated Amortization
Customer relationships & other | $ | 187,732 |  |  | $ | 75,794 |  |  | 23 |  | $ | 184,699 |  |  | $ | 65,417 |
Unpatented technology | 13,429 |  |  | 2,439 |  |  | 13 |  | 13,503 |  |  | 2,633 |
Total amortizable intangible assets | 201,161 |  |  | 78,233 |  |  |  |  | 198,202 |  |  | 68,050 |
Trademarks | 227,097 |  |  | — |  |  |  |  | 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.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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