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Goodwill and Intangible Assets, Net - Details of Total Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Goodwill and Intangible Assets, Net [Abstract] |  |  |  |  |
Goodwill, Beginning Balance |  | $ 2,622,644 |  | $ 2,578,645 |
Goodwill resulting from acquisitions |  | 48,395 | [1] | 104,151 | [2]
Decrease in goodwill as a result of divestiture | [3] |  |  | (61,396) |
Other |  | (8,214) |  | 1,244 |
Goodwill, Ending Balance |  | $ 2,662,825 |  | $ 2,622,644 |
[1] | Mainly relates to the acquisitions of DevOps and Roam, see also Note 3. In allocating the total preliminary purchase price for Roam, based on estimated fair values, the Company recorded $24,607 of goodwill, $11,454 of customer relationships to be amortized over approximately five years and $2,299 of core technology to be amortized over two years. In allocating the total preliminary purchase price for DevOps, based on estimated fair values, the Company recorded $23,787 of goodwill, $2,616 of customer relationships to be amortized over approximately five years.
[2] | Mainly relates to the acquisition of Sourced Group. In allocating the total purchase price for Sourced Group, based on estimated fair values, the Company recorded $79,863 of goodwill, $18,211 of customer relationships to be amortized over approximately seven years and $3,056 of core technology to be amortized over three years.
[3] | Relates to the divestiture of OpenMarket completed on December 31, 2020, see also Note 3.

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