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Investments - Additional Information (Details) - USD ($)
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]      
Other-than-temporary impairment charges recognized $ 0 $ 0  
Gain (loss) on sale of debt investments 0 $ 0  
Acquired Indefinite-lived Intangible Assets [Line Items]      
Acquisition-related contingent consideration, current 1,823,000   $ 1,849,000
ICAR | Other current liabilities      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Acquisition-related contingent consideration, current 1,800,000    
ICAR | Other non-current liabilities      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Acquisition-related contingent consideration, noncurrent $ 1,200,000