Stock-Based Compensation - Schedule of RSUs Activity (Details) - Restricted stock units	9 Months Ended
	Jun. 30, 2025 $ / shares shares
Number of RSUs
Beginning of period (in shares) | shares	4,913,312
Granted (in shares) | shares	2,711,009
Vested (in shares) | shares	(1,383,568)
Forfeited (in shares) | shares	(259,831)
End of period (in shares) | shares	5,980,922
Weighted- Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share) | $ / shares	$ 49.61
Granted (in dollars per share) | $ / shares	19.49
Vested (in dollars per share) | $ / shares	43.96
Forfeited (in dollars per share) | $ / shares	32.96
Ending balance (in dollars per share) | $ / shares	$ 37.97