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GOODWILL AND OTHER INTANGIBLES
 3 Months Ended
Dec. 31, 2023
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 three months ended December 31, 2023. The following table provides a summary of the carrying value of goodwill by segment as of September 30, 2023 and December 31, 2023, as follows:
 
Consumer and Professional Products$136,611 
Home and Building Products191,253 
Total$327,864 
The following table provides the gross carrying value and accumulated amortization for each major class of intangible assets:
 At December 31, 2023 At September 30, 2023
 Gross Carrying AmountAccumulated
Amortization		Average
Life
(Years)		Gross Carrying AmountAccumulated
Amortization
Customer relationships & other$449,373 $119,571 23$443,164 $113,057 
Technology and patents15,734 3,951 1315,504 3,815 
Total amortizable intangible assets465,107 123,522  458,668 116,872 
Trademarks290,526 —  293,447 — 
Total intangible assets$755,633 $123,522  $752,115 $116,872 
 
The gross carrying amount of intangible assets was impacted by $3,518 related to favorable foreign currency translation.
Amortization expense for intangible assets was $5,556 and $5,624 for the quarters ended December 31, 2023 and 2022, 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 - $15,798; 2025 - $21,354; 2026 - $21,354; 2027 - $21,354; 2028 - $21,354; 2029 - $21,354; thereafter $219,017.