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Nature of Operations and Summary of Significant Accounting Policies - Company's Assets Measured at Fair Value (Detail) - USD ($) | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 87,886,000 | $ 85,938,000
Equities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 11,338,000 | 2,408,000
Mutual Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 7,155,000 | 5,212,000
Exchange Traded Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 3,417,000 | 510,000
Corporate Bonds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 7,196,000 |
Government Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 54,542,000 | 69,583,000
Cash and Money Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 4,238,000 | 8,225,000
Level 1 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 80,690,000 | 85,938,000
Level 1 [Member] | Equities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 11,338,000 | 2,408,000
Level 1 [Member] | Mutual Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 7,155,000 | 5,212,000
Level 1 [Member] | Exchange Traded Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 3,417,000 | 510,000
Level 1 [Member] | Government Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 54,542,000 | 69,583,000
Level 1 [Member] | Cash and Money Funds [Member] |  |
Investment Holdings [Line Items] |  |
Total | 4,238,000 | $ 8,225,000
Level 2 [Member] |  |
Investment Holdings [Line Items] |  |
Total | 7,196,000 |
Level 2 [Member] | Corporate Bonds [Member] |  |
Investment Holdings [Line Items] |  |
Total | $ 7,196,000 |

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