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GOODWILL AND OTHER INTANGIBLES
 6 Months Ended
Mar. 31, 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 six months ended March 31, 2024. The following table provides a summary of the carrying value of goodwill by segment as of September 30, 2023 and March 31, 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 March 31, 2024 At September 30, 2023
 Gross Carrying AmountAccumulated
Amortization		Average
Life
(Years)		Gross Carrying AmountAccumulated
Amortization
Customer relationships & other$447,152 $124,198 23$443,164 $113,057 
Technology and patents16,663 4,304 1315,504 3,815 
Total amortizable intangible assets463,815 128,502  458,668 116,872 
Trademarks289,889 —  293,447 — 
Total intangible assets$753,704 $128,502  $752,115 $116,872 
 
The gross carrying amount of intangible assets was impacted by $1,589 related to favorable foreign currency translation.
Amortization expense for intangible assets was $5,581 and $5,653 for the quarters ended March 31, 2024 and 2023, respectively, and $11,137 and $11,277 for the six months ended March 31, 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 - $11,037; 2025 - $22,174; 2026 - $22,174; 2027 - $22,174; 2028 - $22,174; 2029 - $21,354; thereafter $214,226.