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Investments - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
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	0
Debt Securities, Available-for-sale [Line Items]
Acquisition-related consideration, current	11,050,000	$ 753,000
Acquisition-related consideration, noncurrent	5,720,000
ID R&D
Debt Securities, Available-for-sale [Line Items]
Acquisition-related consideration, current	11,100,000
Acquisition-related consideration, noncurrent	5,700,000
Maximum payout of contingent consideration liability	$ 22,100,000

X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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- Definition

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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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ 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.

+ References

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