Note 7 — Goodwill and Other Intangibles

The changes in the carrying value of goodwill were as follows:


	Adhesives, Sealants and Additives		Industrial Tapes		Corrosion Protection and Waterproofing		Consolidated
Balance at August 31, 2019	$	50,090	$	21,215	$	10,681	$	81,986
Foreign currency translation adjustment		196		—		12		208
Balance at November 30, 2019	$	50,286	$	21,215	$	10,693	$	82,194

The Company’s goodwill is allocated to each reporting unit based on the nature of the products manufactured by the respective business combinations that originally created the goodwill. The Company has identified a total of three reporting units within its three operating segments that are used to evaluate the possible impairment of goodwill. Goodwill impairment exists when the carrying value of goodwill exceeds its fair value. Assessments of possible impairment of goodwill are made when events or changes in circumstances indicate that the carrying value of the asset may not be recoverable through future operations. Additionally, testing for possible impairment of recorded goodwill and certain intangible asset balances is required annually. The amount and timing of any impairment charges based on these assessments require the estimation of future cash flows and the fair market value of the related assets based on management’s best estimates of certain key factors, including future selling prices and volumes; operating, raw material and energy costs; and various other projected operating and economic factors. When testing, fair values of the reporting units and the related implied fair values of their respective goodwill are established using discounted cash flows. The Company evaluates the possible impairment of goodwill annually during the fourth quarter, and whenever events or circumstances indicate the carrying value of goodwill may not be recoverable.

In fiscal 2017, the Company early adopted ASU No. 2017-04 “Intangibles - Goodwill and Other Topics (Topic 350): Simplifying the Test for Goodwill Impairment.” We assess goodwill for impairment by comparing the fair value of the reporting unit to its carrying amount. If the fair value of a reporting unit is less than its carrying value, an impairment loss, limited to the amount of goodwill allocated to that reporting unit, is recorded.

Intangible assets subject to amortization consisted of the following as of November 30, 2019 and August 31, 2019:


	Weighted Average		Gross Carrying		Accumulated		Net Carrying
	Amortization Period		Value		Amortization		Value
November 30, 2019
Patents and agreements	14.6	years	$	1,760	$	1,696	$	64
Formulas and technology	7.8	years		10,217		8,309		1,908
Trade names	5.8	years		8,548		7,418		1,130
Customer lists and relationships	9.1	years		98,623		51,878		46,745
			$	119,148	$	69,301	$	49,847

August 31, 2019
Patents and agreements	14.6	years	$	1,760	$	1,693	$	67
Formulas and technology	7.8	years		10,164		7,969		2,195
Trade names	5.8	years		8,503		7,261		1,242
Customer lists and relationships	9.1	years		98,139		48,939		49,200
			$	118,566	$	65,862	$	52,704

Aggregate amortization expense related to intangible assets for the three months ended November 30, 2019 and 2018 was $2,914 and $3,113 respectively. Estimated amortization expense for the remainder of fiscal year 2020 and for the next five years is as follows:


Years ending August 31,
2020 (remaining 9 months)	$	8,667
2021		11,051
2022		10,031
2023		6,768
2024		5,659
2025		5,552