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Investments - Additional Information (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |  |  |
Other-than-temporary impairment charges recognized in earnings | $ 0 | $ 0 | $ 0
Realized gains (losses) from sale of available-for-sale securities | 0 | $ 0 | $ (49,000)
ICAR |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Acquisition-related consideration, noncurrent | $ 800,000 |  |

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284422-111562 + Details
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