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Investments - Schedule of Investments to be Available-for-sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost $ 46,623  
Gross Unrealized (Loss) (1,204)  
Fair Value [1] 45,419 $ 11,777
Cash and Receivables    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 350  
Fair Value 350  
U.S. Government Sponsored Agencies    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 10,735  
Gross Unrealized (Loss) (192)  
Fair Value 10,543  
Corporate Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 30,427  
Gross Unrealized (Loss) (928)  
Fair Value 29,499  
Foreign Bonds and Notes    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 5,111  
Gross Unrealized (Loss) (84)  
Fair Value $ 5,027  
[1] See Note 2 - Investments.