Equity Incentive Plans and Stock-Based Compensation - Additional Information (Details)							1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 16, 2024 shares	Oct. 07, 2024	Aug. 26, 2024	Jun. 05, 2024 tradingDay	Sep. 06, 2023	Jun. 30, 2023 USD ($) officer	Nov. 30, 2021 USD ($) stockholder shares	Sep. 30, 2024 USD ($) nonemployee_Director shares	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) nonemployee_Director $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Mar. 31, 2024 USD ($)	Sep. 17, 2024 nonemployee_Director
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense								$ 19,486,000	$ 23,741,000	$ 41,063,000	$ 74,840,000
Weighted-average grant date fair values of options granted (in usd per share) | $ / shares										$ 4.61	$ 17,400,000
Intrinsic value of vested options exercised										$ 0	$ 1,000,000.0
Unrecognized stock-based compensation cost								17,400,000		$ 17,400,000
Weighted average period over which unrecognized compensation is expected to be recognized										2 years 1 month 6 days
Lemonaid Health, Inc.
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period							4 years
Common stock granted subject to vest, weighted average grant date fair value							$ 43,900,000
Former officers terminated | officer						1
Lemonaid Health, Inc. | Former Lemonaid Officer
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized stock-based compensation cost								0		$ 0
Lemonaid Health, Inc. | Former Lemonaid Officer | General and administrative
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense								0	400,000	0	25,100,000
Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Reverse stock split			0.200
Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Reverse stock split			0.0333
Outstanding stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Tax benefit recognized from stock option exercises								0	0	$ 0	0
Outstanding stock options | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period					3 years
Outstanding stock options | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period					4 years
Unvested restricted stock units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares) | shares										3,070,895
Weighted average period over which unrecognized compensation is expected to be recognized										2 years 4 months 24 days
Unrecognized stock-based compensation cost								$ 73,600,000		$ 73,600,000
Unvested restricted stock units | Lemonaid Health, Inc. | Former Lemonaid Officer | General and administrative
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense						$ 22,000,000.0
Subsequent Event
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Reverse stock split	0.05	0.05
Class A Common Stock | Lemonaid Health, Inc.
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock granted subject to vest (in shares) | shares							187,352
Class A Common Stock | Lemonaid Health, Inc. | Former Lemonaid Officer
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Former stockholders who were granted shares | stockholder							2
A&R Plan | Class A Common Stock | Subsequent Event
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares authorized (in shares) | shares	10,034,656
Second A And R Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Percentage of shares automatically added annually					5.00%
Non-employee directors, electing to defer settlement of RSUs | nonemployee_Director													2
Non-employee directors, eligible to participate in the program | nonemployee_Director								0		0
Second A And R Plan | Outstanding stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation terms of award					Options have a contractual life of up to ten years. The exercise price of a stock option shall not be less than 100% of the estimated fair value of the shares on the date of grant, as determined by the Board of Directors.
Share-based payment award, expiration period					10 years
Exercise price of stock options as a percentage of fair value of shares					100.00%
Number of shares of common stock received for each option exercised					1
Second A And R Plan | Unvested restricted stock units | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period					1 year
Second A And R Plan | Unvested restricted stock units | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period					4 years
Second A And R Plan | Class A Common Stock | Subsequent Event
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Reverse stock split	0.05
Annual Incentive Plan | Unvested restricted stock units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Performance period												1 year
Granted (in shares) | shares								607,222
Total stock-based compensation expense								$ 2,900,000	$ 2,400,000	$ 7,000,000.0	$ 6,800,000
Other current liabilities for awards								$ 7,000,000.0		$ 7,000,000.0		$ 6,500,000
Annual Incentive Plan | Class A Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Days preceding date of payment | tradingDay				20
ESPP | Subsequent Event
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares authorized (in shares) | shares	580,456
ESPP | Subsequent Event | Employee Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock issued and outstanding, percentage	1.00%
Potential annual increase in shares reserved for future issuance (in shares) | shares	250,000
A And R ESPP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average grant date fair value (in usd per share) | $ / shares										$ 2.52	$ 8.78
A And R ESPP | Employee Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
ESPP concurrent offering period										12 months
ESPP successive purchase period										6 months
A And R ESPP | Class A Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Average exercise price (in usd per share) | $ / shares										$ 5.35	$ 18.70
A And R ESPP | Class A Common Stock | Employee Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Issuance of common stock under employee stock purchase plan (in shares) | shares										61,807	75,472,000,000
A And R ESPP | Class A Common Stock | Subsequent Event
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Reverse stock split	0.05