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Business Combinations - Intangible Assets Acquired (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Customer relationships |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortization Period | 4 years 9 months 18 days | 4 years 9 months 18 days |
A2iA |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Amount assigned |  |  | $ 28,610
A2iA | Completed technologies |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortization Period |  |  | 7 years
Amount assigned |  |  | $ 13,015
A2iA | Customer relationships |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortization Period |  |  | 5 years
Amount assigned |  |  | $ 15,360
A2iA | Trade names |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortization Period |  |  | 5 years
Amount assigned |  |  | $ 235
ICAR |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Amount assigned |  |  | $ 6,407
ICAR | Completed technologies |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortization Period |  |  | 5 years
Amount assigned |  |  | $ 4,956
ICAR | Customer relationships |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortization Period |  |  | 2 years
Amount assigned |  |  | $ 1,298
ICAR | Trade names |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Amortization Period |  |  | 3 years
Amount assigned |  |  | $ 153

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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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. + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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