GOODWILL AND OTHER INTANGIBLES

6 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

The following table provides changes in the carrying value of goodwill by segment during the six months ended March 31, 2020:



	At September 30, 2019		Goodwill from acquisitions		Other adjustments including currency translations			At March 31, 2020
Consumer and Professional Products	$	227,269	$	3,125	$	(3,410	)	$	226,984
Home and Building Products	191,253		—		—			191,253
Defense Electronics	18,545		—		—			18,545
Total	$	437,067	$	3,125	$	(3,410	)	$	436,782

The following table provides the gross carrying value and accumulated amortization for each major class of intangible assets:



	At March 31, 2020					At September 30, 2019
	Gross Carrying Amount		Accumulated Amortization		Average Life (Years)	Gross Carrying Amount		Accumulated Amortization
Customer relationships & other	$	182,035	$	60,935	23	$	183,515	$	57,783
Technology and patents	19,076		7,715		13	19,167		7,329
Total amortizable intangible assets	201,111		68,650			202,682		65,112
Trademarks	221,282		—			219,069		—
Total intangible assets	$	422,393	$	68,650		$	421,751	$	65,112

Amortization expense for intangible assets was $2,403 and $2,512 for the quarters ended March 31, 2020 and 2019, respectively, and $4,796 and $4,930 for the six months ended March 31, 2020 and 2019. Amortization expense for the remainder of 2020 and the next five fiscal years and thereafter, based on current intangible balances and classifications, is estimated as follows: 2020 - $4,797; 2021 - $9,387; 2022 - $9,387; 2023 - $9,234; 2024 - $9,208; 2025 - $9,208; thereafter $81,240.

Griffon performs its annual goodwill impairment testing in the fourth quarter of each year. The 2019 impairment testing resulted in all three reporting units having fair values substantially in excess of their carrying values. In addition to the annual impairment test, the Company is required to regularly assess whether a triggering event has occurred which would require interim impairment testing. Given the general deterioration in economic and market conditions surrounding the COVID-19 pandemic, the Company considered the impact that the COVID-19 pandemic may have on its near and long-term forecasts and completed an interim impairment test. The company determined that there is no impairment to either its goodwill or indefinite-lived intangible assets at March 31, 2020.