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Business Combinations - Additional Information (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2021 USD ($) business	Sep. 30, 2020 USD ($) business	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Number of businesses acquired | business	0	0
Goodwill	$ 788,185	$ 812,364	$ 803,542
EZMCOM
Business Acquisition [Line Items]
Common stock acquired			100.00%
Cash consideration			$ 18,600
Intangible assets acquired			$ 6,000
Weighted average useful life			4 years 8 months 23 days
Goodwill			$ 11,200

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

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