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Nature of Operations and Summary of Significant Accounting Policies - Company's Assets Measured at Fair Value (Detail) - USD ($) | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Total | $ 89,927,000 | $ 84,252,000
Level 1 [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Total | 55,633,000 | 51,092,000
Level 2 [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Total | 34,294,000 | 33,160,000
Exchange Traded Funds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Total | 3,686,000 | 3,327,000
Exchange Traded Funds [Member] | Level 1 [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Total | 3,686,000 | 3,327,000
Corporate Bonds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Total | 34,294,000 | 33,160,000
Corporate Bonds [Member] | Level 2 [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Total | 34,294,000 | 33,160,000
Government Securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Total | 50,111,000 | 47,672,000
Government Securities [Member] | Level 1 [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Total | 50,111,000 | 47,672,000
Cash and Money Funds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Total | 1,836,000 | 93,000
Cash and Money Funds [Member] | Level 1 [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Total | $ 1,836,000 | $ 93,000

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