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Business Combinations - Additional Information (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 09, 2019 USD ($) | Sep. 30, 2018 USD ($) business | Sep. 30, 2017 USD ($) business | Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of businesses acquired | business |  | 0 | 0 |
Goodwill |  | $ 800,890 | $ 804,414 | $ 803,542
EZMCOM |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common stock acquired | 100.00% |  |  |
Cash consideration | $ 18,600 |  |  |
Cash Acquired from Acquisition | 2,700 |  |  |
Intangible assets acquired | $ 6,000 |  |  |
Weighted average useful life | 4 years 8 months 23 days |  |  |
Goodwill | $ 11,200 |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in 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 (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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