Due to macroeconomic conditions, we concluded that indicators of impairment were present and performed an interim quantitative impairment test as of June 30, 2022. The fair value of our reporting unit was determined using a combination of the income approach and the market approach. We weighted the methodologies appropriately to estimate a fair value of approximately $995 million as of June 30, 2022. The estimated fair value exceeded the $950 million carrying value of our reporting unit by approximately $45 million, or 5% of the carrying value. Based upon the results of the impairment test, no goodwill impairment was recorded as of June 30, 2022.

On July 1, 2022, we completed the annual impairment testing of our goodwill. We elected to rely on a qualitative assessment and as a result we determined it is more likely than not that the fair value of our reporting unit is greater than its carrying amount.

At September 30, 2022, we performed a quantitative impairment test. We concluded indicators of impairment were present due to the current macroeconomic conditions, including continued declines in our stock price. The fair value of our reporting unit was determined using a combination of the income approach and the market approach. For the income approach, fair value was determined based on the present value of estimated future after-tax cash flows using our multi-year target plan, discounted at an appropriate risk-adjusted rate. For the market approach, we used a valuation technique in which values were derived based on valuation multiples of comparable publicly traded companies.

We weighted the methodologies appropriately to estimate a fair value of approximately $713.0 million as of September 30, 2022. The carrying value of our reporting unit exceeded the estimated fair value. Based upon the results of the impairment test, we recorded a goodwill impairment charge of $213.7 million within the Consolidated Statement of Operations.

The changes in the carrying amount of goodwill for the fiscal years ended September 30, 2022 and 2021 were as follows (dollars in thousands):


	Total
Balance as of October 1, 2020	$	1,128,198
Effect of foreign currency translation		313
Balance as of September 30, 2021		1,128,511
Goodwill impairment		(213,720	)
Effect of foreign currency translation		(23,989	)
Balance as of September 30, 2022	$	890,802

On September 30, 2022, we concluded that indicators of impairment were present and performed a test for recoverability of our long-lived asset group as of September 30, 2022. Based upon the results of the recoverability test, we determined that the carrying amounts of the long-lived asset group were considered recoverable, concluding the test and resulting in no impairment of our long-lived asset group as of September 30, 2022.

The following tables summarizes the gross carrying amounts and accumulated amortization of intangible assets by major class (dollars in thousands):


	September 30, 2022
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Remaining Life (Years)
Customer relationships	$	104,498	$	(95,315	)	$	9,183		1.7
Technology and patents		88,600		(88,083	)		517		1.2
Total	$	193,098	$	(183,398	)	$	9,700


	September 30, 2021
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Remaining Life (Years)
Customer relationships	$	110,485	$	(88,638	)	$	21,847		2.2
Technology and patents		90,738		(87,237	)		3,501		0.9
Total	$	201,223	$	(175,875	)	$	25,348

Amortization expense for acquired technology and patents is included in the cost of revenue in the accompanying Consolidated Statements of Operations and amounted to $3.0 million, $7.5 million, and $8.3 million for the fiscal years ended September 30, 2022, 2021, and 2020, respectively. Amortization expense for customer relationships is included in operating expenses and amounted to $11.5 million, $12.7 million, and $12.6 million in the fiscal years ended September 30, 2022, 2021, and 2020, respectively. Estimated amortization for each of the five succeeding years and thereafter as of September 30, 2022, is as follows (dollars in thousands):


Year Ending September 30,	Cost of Revenues		Operating Expenses		Total
2023	$	414	$	5,774	$	6,188
2024		103		2,085		2,188
2025		—		1,324		1,324
Total	$	517	$	9,183	$	9,700