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Nature of Operations and Summary of Significant Accounting Policies - Company's Assets Measured at Fair Value (Detail) - USD ($) | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 89,498,000 | $ 105,322,000
Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 61,621,000 | 66,632,000
Level 2 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 27,877,000 | 38,690,000
Equities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 11,949,000 | 10,412,000
Equities [Member] | Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 11,949,000 | 10,412,000
Mutual Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 9,595,000 | 3,987,000
Mutual Funds [Member] | Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 9,595,000 | 3,987,000
Exchange Traded Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 10,344,000 | 5,163,000
Exchange Traded Funds [Member] | Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 10,344,000 | 5,163,000
Corporate Bonds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 27,877,000 | 38,690,000
Corporate Bonds [Member] | Level 2 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 27,877,000 | 38,690,000
Government Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 16,147,000 | 45,171,000
Government Securities [Member] | Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 16,147,000 | 45,171,000
Cash and Money Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 13,586,000 | 1,899,000
Cash and Money Funds [Member] | Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | $ 13,586,000 | $ 1,899,000

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