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Fair Value Measurements - Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unrealized loss position, less than 12 months, fair value |  | $ 684
Unrealized loss position, less than 12 months, gross unrealized loss |  | (2)
Unrealized loss position, more than 12 months, fair value |  | 496
Unrealized loss position, more than 12 months, gross unrealized loss |  | (8)
Unrealized loss position, fair value | $ 0 | 1,180
Unrealized loss position, gross unrealized loss |  | (10)
Certificates of Deposit [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unrealized loss position, less than 12 months, fair value |  | 0
Unrealized loss position, less than 12 months, gross unrealized loss |  | 0
Unrealized loss position, more than 12 months, fair value |  | 0
Unrealized loss position, more than 12 months, gross unrealized loss |  | 0
Unrealized loss position, fair value |  | 0
Unrealized loss position, gross unrealized loss |  | 0
U.S. Government Agency Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unrealized loss position, less than 12 months, fair value |  | 0
Unrealized loss position, less than 12 months, gross unrealized loss |  | 0
Unrealized loss position, more than 12 months, fair value |  | 0
Unrealized loss position, more than 12 months, gross unrealized loss |  | 0
Unrealized loss position, fair value |  | 0
Unrealized loss position, gross unrealized loss |  | 0
Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unrealized loss position, less than 12 months, fair value |  | 684
Unrealized loss position, less than 12 months, gross unrealized loss |  | (2)
Unrealized loss position, more than 12 months, fair value |  | 235
Unrealized loss position, more than 12 months, gross unrealized loss |  | (5)
Unrealized loss position, fair value |  | 919
Unrealized loss position, gross unrealized loss |  | (7)
Corporate Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unrealized loss position, less than 12 months, fair value |  | 0
Unrealized loss position, less than 12 months, gross unrealized loss |  | 0
Unrealized loss position, more than 12 months, fair value |  | 261
Unrealized loss position, more than 12 months, gross unrealized loss |  | (3)
Unrealized loss position, fair value |  | 261
Unrealized loss position, gross unrealized loss |  | $ (3)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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