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Investments - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Other-than-temporary impairment charges recognized in earnings	$ 0	$ 0	$ 0
Realized gains (losses) from sale of available-for-sale securities	0	49,000	$ 0
Debt Securities, Available-for-sale [Line Items]
Acquisition-related consideration, current	1,036,000	$ 1,849,000
Other Current Liabilities | ICAR
Debt Securities, Available-for-sale [Line Items]
Acquisition-related consideration, current	1,000,000.0
Other Noncurrent Liabilities | ICAR
Debt Securities, Available-for-sale [Line Items]
Acquisition-related consideration, noncurrent	$ 600,000

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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+ References

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings.

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