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Fair Value Measurement - Assets Categorized on Basis of Various Levels (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market fund deposits $ 320 $ 1,592
Mutual fund investments 8 7
Total 328 1,599
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market fund deposits 320 1,592
Mutual fund investments 8 7
Total $ 328 $ 1,599