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Acquisitions and Divestiture of a Subsidiary - Additional Information (Detail) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 10, 2020 USD ($) | Sep. 30, 2021 USD ($) Business | Sep. 30, 2020 USD ($) Business
Acquisitions and Divestiture of a Subsidiary [Line Items] |  |  |
Business acquisition |  | $ 101,864 | $ 280,808
Number of businesses acquired | Business |  | 3 | 3
Signed agreement for the divestiture of Open Market | $ 300,000 |  |
Business divestiture pre-tax gain |  | $ 226,410 |
Disposal Group, Including Discontinued Operation, Net assets |  | 9,194 |
Disposal Group, Including Discontinued Operation, Goodwill |  | $ 61,396 |

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- Definition In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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