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Investments (Tables) | 12 Months Ended
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Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Schedule of Held-to-Maturity Investments | The amortized cost, gross unrealized gains or losses, and fair value of investments classified as held-to-maturity at September 30, 2020 were as follows:
|  |  |  | Gross Unrealized |  | Estimated Fair
Due in less than 1 year: |  | Amortized Cost |  | Gains |  | Losses |  | Market Value
Corporate and municipal bonds |  | $ | 38,055 |  |  | $ | 10 |  |  | $ | (33) |  |  | $ | 38,032 |
Total as of September 30, 2020 |  | $ | 38,055 |  |  | $ | 10 |  |  | $ | (33) |  |  | $ | 38,032 |

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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269825-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 + Details
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