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Goodwill and Intangible Assets, Net - Additional Information (Detail) $ in Thousands	12 Months Ended
	Sep. 30, 2023 USD ($) Segment	Sep. 30, 2022 USD ($) Segment	Sep. 30, 2021 USD ($) Segment
Indefinite-Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 0	$ 0	$ 0
Number of operating segment | Segment	1	1	1
Amortization of purchased intangible assets and other	$ 57,156	$ 71,075	$ 78,784
Intangible Assets [Member]
Indefinite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets and other	$ 67,677	$ 97,088	$ 83,816

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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.

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No definition available.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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