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GOODWILL AND OTHER INTANGIBLES
 9 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLES GOODWILL AND OTHER INTANGIBLES
Indicators of impairment were not present for any of Griffon's reporting units during the nine months ended June 30, 2024. The following table provides a summary of the carrying value of goodwill by segment as of September 30, 2023 and June 30, 2024, as follows:
 
Home and Building Products$191,253 
Consumer and Professional Products136,611 
Total$327,864 
The following table provides the gross carrying value and accumulated amortization for each major class of intangible assets:
 At June 30, 2024 At September 30, 2023
 Gross Carrying AmountAccumulated
Amortization		Average
Life
(Years)		Gross Carrying AmountAccumulated
Amortization
Customer relationships & other$447,339 $129,841 23$443,164 $113,057 
Technology and patents16,890 4,705 1315,504 3,815 
Total amortizable intangible assets464,229 134,546  458,668 116,872 
Trademarks290,184 —  293,447 — 
Total intangible assets$754,413 $134,546  $752,115 $116,872 
 
The gross carrying amount of intangible assets was impacted by $624 related to favorable foreign currency translation.
Amortization expense for intangible assets was $5,858 and $5,669 for the quarters ended June 30, 2024 and 2023, respectively, and $16,995 and $16,946 for the nine months ended June 30, 2024 and 2023, respectively. Amortization expense for the remainder of 2024 and the next five fiscal years and thereafter, based on current intangible balances and classifications, is estimated as follows: remaining in 2024 - $5,179; 2025 - $22,174; 2026 - $22,174; 2027 - $22,174; 2028 - $22,174; 2029 - $21,353; thereafter $214,455.