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Goodwill and Intangible Assets, Net - Details of Total Goodwill (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Goodwill [Line Items] |  |  |  |
Goodwill resulting from acquisitions | $ 48,395 | [1] | $ 104,151 | [2]
Value of intangible asset | 178,312 |  | 259,032 |
Core Technology [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Value of intangible asset | 61,044 |  | 118,730 |
Customer Relationships [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Value of intangible asset | 112,705 |  | 133,038 |
Sourced [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from acquisitions |  |  | $ 79,863 |
Sourced [Member] | Trademark [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Useful life of intangible assets |  |  | 3 years |
Sourced [Member] | Core Technology [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Value of intangible asset |  |  | $ 3,056 |
Sourced [Member] | Customer Relationships [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Value of intangible asset |  |  | $ 18,211 |
Useful life of intangible assets |  |  | 7 years |
Roam [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from acquisitions | 24,607 |  |  |
Roam [Member] | Core Technology [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Value of intangible asset | $ 2,299 |  |  |
Useful life of intangible assets | 2 years |  |  |
Roam [Member] | Customer Relationships [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Value of intangible asset | $ 11,454 |  |  |
Useful life of intangible assets | 5 years |  |  |
DevOps [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from acquisitions | $ 23,787 |  |  |
DevOps [Member] | Customer Relationships [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Value of intangible asset | $ 2,616 |  |  |
Useful life of intangible assets | 5 years |  |  |
[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.

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