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Goodwill and Intangible Assets, Net (Tables) | 12 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Details of Total Goodwill | The following table presents details of the Company’s total goodwill:
As of September 30, 2023 |  | $ | 2,749,041 |
Goodwill resulting from acquisitions(1) |  |  | 95,867 |
As of September 30, 2024 |  | $ | 2,844,908 |
Goodwill resulting from acquisitions(2) |  |  | 45,772 |
As of September 30, 2025 |  | $ | 2,890,680 |
(1) Mainly relates to the acquisition of Astadia, which specializes in mainframe-to-cloud migration and modernization, see also Note 3. In allocating the total purchase price of Astadia, based on estimated fair values, the Company recorded $86,381 of goodwill, $27,677 of customer relationships to be amortized over approximately six years, $8,001 of core technology to be amortized over approximately four years, and $1,784 of trademark to be amortized over approximately three years. (2) Mainly relates to the acquisitions of Profinit, a data science and engineering company and the telco network engineering business of MOBIA, see also Note 3. In allocating the total preliminary purchase price of Profinit, based on estimated fair values, the Company recorded $29,165 of goodwill, and $19,324 of customer relationships to be amortized over approximately five years. In allocating the total preliminary purchase price of Mobia, based on estimated fair values, the Company recorded $4,025 of goodwill, and $13,830 of customer relationships to be amortized over approximately six years.
Details Regarding Total Definite-Lived Purchased Intangible Assets | The following table presents details regarding the Company’s total definite-lived purchased intangible assets:
|  | Gross |  |  | Accumulated Amortization |  |  | Net |
September 30, 2025 |  |  |  |  |  |  |  |  |
Core technology |  | $ | 955,188 |  |  | $ | (920,202 | ) |  | $ | 34,986 |
Customer relationships |  |  | 815,818 |  |  |  | (695,669 | ) |  |  | 120,149 |
Other |  |  | 50,188 |  |  |  | (49,041 | ) |  |  | 1,147 |
Total |  | $ | 1,821,194 |  |  | $ | (1,664,912 | ) |  | $ | 156,282 |
September 30, 2024 |  |  |  |  |  |  |  |  |
Core technology |  | $ | 947,733 |  |  | $ | (898,086 | ) |  | $ | 49,647 |
Customer relationships |  |  | 766,251 |  |  |  | (658,173 | ) |  |  | 108,078 |
Other |  |  | 50,188 |  |  |  | (47,184 | ) |  |  | 3,004 |
Total |  | $ | 1,764,172 |  |  | $ | (1,603,443 | ) |  | $ | 160,729 |
Estimated Future Amortization Expense | The estimated future amortization expense of definite-lived purchased intangible assets as of September 30, 2025 is as follows:
|  | Amount |
Fiscal year: |  |  |
2026 |  | $ | 51,772 |
2027 |  |  | 42,074 |
2028 |  |  | 33,284 |
2029 |  |  | 20,498 |
3030 |  |  | 6,674 |
Thereafter |  |  | 1,980 |
Total |  | $ | 156,282 |

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