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v3.22.2.2

Nature of Operations and Summary of Significant Accounting Policies - Company's Assets Measured at Fair Value (Detail) - USD ($) | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 89,300,000 | $ 94,976,000
Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 51,961,000 | 70,123,000
Level 2 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 37,339,000 | 24,853,000
Equities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 12,149,000 | 14,734,000
Equities [Member] | Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 12,149,000 | 14,734,000
Mutual Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 5,337,000 | 10,357,000
Mutual Funds [Member] | Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 5,337,000 | 10,357,000
Exchange Traded Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 4,794,000 | 9,458,000
Exchange Traded Funds [Member] | Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 4,794,000 | 9,458,000
Corporate Bonds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 37,339,000 | 24,853,000
Corporate Bonds [Member] | Level 2 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 37,339,000 | 24,853,000
Government Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 29,327,000 | 30,999,000
Government Securities [Member] | Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 29,327,000 | 30,999,000
Cash and Money Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 354,000 | 4,575,000
Cash and Money Funds [Member] | Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | $ 354,000 | $ 4,575,000

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