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Goodwill and Intangible Assets | 6 Months Ended
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Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | 6. Goodwill and Intangible Assets Goodwill and acquired intangible assets consisted of the following:
(in thousands) |  | March 31, 2026 |  |  | September 30, 2025 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |
Goodwill |  |  |  |  |  |  |  | $ | 3,403,009 |  |  |  |  |  |  |  |  | $ | 3,493,316 |
Intangible assets with finite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased software |  | $ | 545,687 |  |  | $ | 394,974 |  |  | $ | 150,713 |  |  | $ | 639,104 |  |  | $ | 472,357 |  |  | $ | 166,747 |
Capitalized software |  |  | 22,877 |  |  |  | 22,877 |  |  |  | — |  |  |  | 22,877 |  |  |  | 22,877 |  |  |  | — |
Customer lists and relationships |  |  | 1,090,276 |  |  |  | 470,332 |  |  |  | 619,944 |  |  |  | 1,149,262 |  |  |  | 505,202 |  |  |  | 644,060 |
Trademarks and trade names |  |  | 31,882 |  |  |  | 19,303 |  |  |  | 12,579 |  |  |  | 38,179 |  |  |  | 24,323 |  |  |  | 13,856 |
Other |  |  | 3,486 |  |  |  | 3,486 |  |  |  | — |  |  |  | 4,019 |  |  |  | 4,019 |  |  |  | — |
Total intangible assets with finite lives |  | $ | 1,694,208 |  |  | $ | 910,972 |  |  | $ | 783,236 |  |  | $ | 1,853,441 |  |  | $ | 1,028,778 |  |  | $ | 824,663 |
Total goodwill and acquired intangible assets |  |  |  |  |  |  |  | $ | 4,186,245 |  |  |  |  |  |  |  |  | $ | 4,317,979 |
Changes in Goodwill were as follows:
(in thousands) |  |  |
Balance, October 1, 2025 |  | $ | 3,493,316 |
Divestiture of businesses |  |  | (82,204 | )
Foreign currency translation adjustment |  |  | (8,103 | )
Balance, March 31, 2026 |  | $ | 3,403,009 |
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, 2026 |  |  | March 31, 2025 |  |  | March 31, 2026 |  |  | March 31, 2025 |
Amortization of acquired intangible assets |  | $ | 12,012 |  |  | $ | 11,380 |  |  | $ | 24,084 |  |  | $ | 22,820 |
Cost of revenue |  |  | 7,768 |  |  |  | 8,131 |  |  |  | 15,668 |  |  |  | 16,431 |
Total amortization expense |  | $ | 19,780 |  |  | $ | 19,511 |  |  | $ | 39,752 |  |  | $ | 39,251 |

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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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