Stockholders’ Equity - Summary of Restricted Stock Units Activity (Details) - Restricted Stock Units	6 Months Ended
	Mar. 31, 2026 $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	657,818,000
Awarded (in shares) | shares	817,629,000
Vested (in shares) | shares	(306,767,000)
Forfeited (in shares) | shares	(14,228,000)
Ending balance (in shares) | shares	1,154,452,000
Weighted Average Grant Date Fair Value
Beginning balance (in usd per share) | $ / shares	$ 25.29
Awarded (in usd per shares) | $ / shares	15.82
Vested (in usd per shares) | $ / shares	25.18
Forfeited (in usd per shares) | $ / shares	19.30
Ending balance (in usd per share) | $ / shares	$ 18.69