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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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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.

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- Definition

Amount classified as goodwill attributable to disposal group held for sale or disposed of.

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Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of.

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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The number of businesses acquired by the entity during the period.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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