We have two operating and reportable segments: (1) Software Products and (2) Professional Services. We assess goodwill for impairment at the reporting unit level. Our reporting units are determined based on the components of our operating segments that constitute a business for which discrete financial information is available and for which operating results are regularly reviewed by segment management. Our reporting units are the same as our operating segments.

As of June 30, 2022, goodwill and acquired intangible assets in the aggregate attributable to our Software Products segment was $2,769.8 million and attributable to our Professional Services segment was $11.5 million. As of September 30, 2021, goodwill and acquired intangible assets in the aggregate attributable to our Software Products segment was $2,525.7 million and attributable to our Professional Services segment was $45.2 million. Acquired intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. We evaluate goodwill for impairment in the third quarter of our fiscal year, or on an interim basis if an event occurs or circumstances change that would, more likely than not, reduce the fair value of a reporting segment below its carrying value. If a reporting unit's carrying value exceeds its fair value, we record an impairment loss equal to the difference between the carrying value of goodwill and its estimated fair value. Factors we consider important, on an overall company basis and segment basis, when applicable, that could trigger an impairment review include significant under-performance relative to historical or projected future operating results, significant changes in our use of the acquired assets or the strategy for our overall business, significant negative industry or economic trends, a significant decline in our stock price for a sustained period and a reduction of our market capitalization relative to net book value.

We completed our annual goodwill impairment review as of June 30, 2022, which consisted of a qualitative assessment of our Software Products segment and a quantitative assessment of our Professional Services segment in conjunction with the sale of a portion of that business to ITC Infotech. Our qualitative assessment for Software Products included company-specific (e.g., financial performance and long-range plans), industry, and macroeconomic factors, as well as consideration of the fair value of each reporting unit relative to its carrying value at the last valuation date (June 27, 2020). Based on our qualitative assessment, we believe it is more likely than not that the fair value of our Software Products reporting unit exceeds its carrying value and no further impairment testing is required. Our quantitative assessment for the Professional Services segment compared the fair value of the reporting unit to its carrying value. We estimated the fair value of the reporting unit using a discounted cash flow valuation model. This model requires estimates of future revenues, profits, capital expenditures, working capital, and a terminal value based on a residual cash flow valuation model. We estimated this amount by evaluating historical trends, current budgets and operating plans, including consideration of the completed transaction with ITC Infotech. Based on a comparison of the estimated fair value to the carrying value of the Professional Services reporting unit as of June 30, 2022, no impairment was required.

Goodwill and acquired intangible assets consisted of the following:


(in thousands)	June 30, 2022						September 30, 2021
	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Goodwill (not amortized)					$	2,382,680					$	2,191,887
Intangible assets with finite lives (amortized):
Purchased software		503,579		352,587		150,992	$	483,771	$	338,542	$	145,229
Capitalized software		22,877		22,877		—		22,877		22,877		—
Customer lists and relationships		604,261		367,082		237,179		574,516		350,648		223,868
Trademarks and trade names		27,865		17,402		10,463		26,906		17,036		9,870
Other		3,856		3,856		—		4,000		4,000		—
Total intangible assets with finite lives	$	1,162,438	$	763,804	$	398,634	$	1,112,070	$	733,103	$	378,967
Total goodwill and acquired intangible assets					$	2,781,314					$	2,570,854

Changes in goodwill presented by reportable segments were as follows:


(in thousands)	Software Products			Professional Services			Total
Balance, October 1, 2021	$	2,148,968		$	42,919		$	2,191,887
Acquisition		240,709			—			240,709
Divestiture of business		—			(32,992	)		(32,992	)
Foreign currency translation adjustment		(16,755	)		(169	)		(16,924	)
Balance, June 30, 2022	$	2,372,922		$	9,758		$	2,382,680

The aggregate amortization expense for intangible assets with finite lives is classified in our Consolidated Statements of Operations as follows:


(in thousands)	Three months ended				Nine months ended
	June 30, 2022		June 30, 2021		June 30, 2022		June 30, 2021
Amortization of acquired intangible assets	$	8,931	$	7,511	$	25,865	$	21,708
Cost of license revenue		6,596		8,260		19,010		21,644
Total amortization expense	$	15,527	$	15,771	$	44,875	$	43,352