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Goodwill and Acquired Intangible Assets | 12 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Acquired Intangible Assets | 6. Goodwill and Acquired Intangible Assets Goodwill and acquired intangible assets consisted of the following:
(in thousands) |  | September 30, 2025 |  |  | September 30, 2024 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |
Goodwill (not amortized) |  |  |  |  |  |  |  | $ | 3,493,316 |  |  |  |  |  |  |  |  | $ | 3,461,891 |
Intangible assets with finite lives (amortized)(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased software |  | $ | 639,104 |  |  | $ | 472,357 |  |  | $ | 166,747 |  |  | $ | 634,439 |  |  | $ | 436,471 |  |  | $ | 197,968 |
Capitalized software |  |  | 22,877 |  |  |  | 22,877 |  |  |  | — |  |  |  | 22,877 |  |  |  | 22,877 |  |  |  | — |
Customer lists and relationships |  |  | 1,149,262 |  |  |  | 505,202 |  |  |  | 644,060 |  |  |  | 1,141,086 |  |  |  | 457,718 |  |  |  | 683,368 |
Trademarks and trade names |  |  | 38,179 |  |  |  | 24,323 |  |  |  | 13,856 |  |  |  | 37,961 |  |  |  | 21,821 |  |  |  | 16,140 |
Other |  |  | 4,019 |  |  |  | 4,019 |  |  |  | — |  |  |  | 3,941 |  |  |  | 3,941 |  |  |  | — |
|  | $ | 1,853,441 |  |  | $ | 1,028,778 |  |  | $ | 824,663 |  |  | $ | 1,840,304 |  |  | $ | 942,828 |  |  | $ | 897,476 |
Total goodwill and acquired intangible assets |  |  |  |  |  |  |  | $ | 4,317,979 |  |  |  |  |  |  |  |  | $ | 4,359,367 |
(1) The weighted-average useful lives of purchased software, customer lists and relationships, and trademarks and trade names with a remaining net book value are 11 years, 17 years, and 11 years, respectively. The weighted-average useful life for all intangible assets with remaining net book value is 16 years. The changes in the carrying amounts of Goodwill from September 30, 2024 to September 30, 2025 are due to the impact of acquisitions and to foreign currency translation adjustments related to those asset balances that are recorded in non-U.S. currencies. Changes in Goodwill were as follows:
(in thousands) |  |  |
Balance, September 30, 2023 |  | $ | 3,358,511 |
pure-systems acquisition |  |  | 77,118 |
Foreign currency translation adjustments |  |  | 26,262 |
Balance, September 30, 2024 |  | $ | 3,461,891 |
Other acquisitions |  |  | 5,977 |
Foreign currency translation adjustments |  |  | 25,448 |
Balance, September 30, 2025 |  | $ | 3,493,316 |
The aggregate amortization expense for intangible assets with finite lives recorded for the years ended September 30, 2025, 2024 and 2023 was reflected in our Consolidated Statements of Operations as follows:
(in thousands) |  | Year ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Amortization of acquired intangible assets |  | $ | 45,948 |  |  | $ | 42,018 |  |  | $ | 40,022 |
Cost of revenue |  |  | 32,828 |  |  |  | 38,495 |  |  |  | 35,694 |
Total amortization expense |  | $ | 78,776 |  |  | $ | 80,513 |  |  | $ | 75,716 |
The estimated aggregate future amortization expense for intangible assets with finite lives remaining as of September 30, 2025 is $79.6 million for 2026, $79.7 million for 2027, $76.9 million for 2028, $73.8 million for 2029, $66.2 million for 2030 and $448.5 million thereafter.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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