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Stock-Based Compensation - Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2019	Mar. 07, 2024
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock compensation expense	$ 6.2
Unrecognized stock compensation expense, period for recognition	2 years
RSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock compensation expense	$ 4.2
Unrecognized stock compensation expense, period for recognition	1 year 8 months 12 days
PSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period, percentage	0.00%
PSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Measurement period, percentage	187.50%
Market PSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period, percentage	0.00%
Market PSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Measurement period, percentage	187.50%
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of options to purchase shares of common stock (in shares)			5.3
Available for future grant (in shares)	4.0
2021 Plan \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration date	10 years
2021 Plan \| Stock Option \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period exercisable after termination	3 months
2021 Plan \| Stock Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period exercisable after termination	12 months
2003 Plan \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration date		7 years