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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