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GOODWILL AND OTHER INTANGIBLES
 6 Months Ended
Mar. 31, 2025
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, 2025. The following table provides a summary of the carrying value of goodwill by segment as of March 31, 2025 and September 30, 2024, as follows:
 At September 30, 2024
Goodwill from acquisitions (1)
Foreign currency translation adjustments
At March 31, 2025
Home and Building Products$191,253 $— $— $191,253 
Consumer and Professional Products138,140 230 (94)138,276 
Total$329,393 $230 $(94)$329,529 
(1) The increase is due to preliminary purchase price allocation adjustments recorded during the three and six months ended March 31, 2025 related to the 2024 Pope acquisition.

The following table provides the gross carrying value and accumulated amortization for each major class of intangible assets:
 At March 31, 2025 At September 30, 2024
 Gross Carrying AmountAccumulated
Amortization		Average
Life
(Years)		Gross Carrying AmountAccumulated
Amortization
Customer relationships & other$447,401 $140,537 17$450,784 $134,296 
Technology and patents17,758 10,446 1017,350 6,859 
Total amortizable intangible assets465,159 150,983  468,134 141,155 
Trademarks290,264 —  291,803 — 
Total intangible assets$755,423 $150,983  $759,937 $141,155 
 
The gross carrying amount of intangible assets was impacted by $4,514 related to unfavorable foreign currency translation.
Amortization expense for intangible assets was $5,792 and $5,581 for the quarters ended March 31, 2025 and 2024, respectively, and $11,556 and $11,137 for the six months ended March 31, 2025 and 2024, respectively. Amortization expense for the remainder of 2025 and the next five fiscal years and thereafter, based on current intangible balances and classifications, is estimated as follows: remaining in 2025 - $11,152; 2026 - $22,708; 2027 - $22,107; 2028 - $22,107; 2029 - $22,107; 2030 - $22,107; thereafter $191,888.