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Investments - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]          
Contractual maturities of available-for-sale securities due within one year $ 49,500,000   $ 49,500,000    
Contractual maturities of available-for-sale securities due beyond one year to five years 19,500,000   19,500,000    
Other-than-temporary impairment charges recognized 0 $ 0 0 $ 0  
Realized gains (losses) from sale of available-for-sale securities 0 $ 0 (300,000) $ 0  
Acquisition-related consideration, current 4,980,000   4,980,000   $ 11,050,000
Acquisition-related contingent consideration $ 100,000   $ 100,000   $ 5,720,000