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Investments - Summary of Contingent Consideration Measured at Fair Value (Details) - Contingent Consideration - ICAR Vision Systems, S.L. $ in Thousands | 12 Months Ended
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Sep. 30, 2019 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
Balance at September 30, 2018 | $ 3,051
Expenses recorded due to changes in fair value | 472
Payment of contingent consideration | (1,818)
Foreign currency effect on contingent consideration | (104)
Balance at September 30, 2019 | $ 1,601

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