Goodwill and Intangible Assets

6 Months Ended

Mar. 31, 2024

6. Goodwill and Intangible Assets

Goodwill and acquired intangible assets consisted of the following:


(in thousands)	March 31, 2024						September 30, 2023
	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Goodwill (not amortized)					$	3,446,373					$	3,358,511
Intangible assets with finite lives (amortized):
Purchased software	$	627,704	$	415,352	$	212,352	$	615,915	$	395,109	$	220,806
Capitalized software		22,877		22,877		—		22,877		22,877		—
Customer lists and relationships		1,136,456		434,530		701,926		1,116,117		413,125		702,992
Trademarks and trade names		37,770		20,577		17,193		36,851		19,400		17,451
Other		3,896		3,896		—		3,867		3,867		—
Total intangible assets with finite lives	$	1,828,703	$	897,232	$	931,471	$	1,795,627	$	854,378	$	941,249
Total goodwill and acquired intangible assets					$	4,377,844					$	4,299,760

Changes in Goodwill were as follows:


(in thousands)
Balance, October 1, 2023	$	3,358,511
Acquisitions		77,118
Foreign currency translation adjustment		10,744
Balance, March 31, 2024	$	3,446,373

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				Six months ended
	March 31, 2024		March 31, 2023		March 31, 2024		March 31, 2023
Amortization of acquired intangible assets	$	10,424	$	10,656	$	20,787	$	18,682
Cost of revenue		9,584		9,834		19,150		15,976
Total amortization expense	$	20,008	$	20,490	$	39,937	$	34,658