Net Loss Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net loss	$ (39,328)	$ (45,492)	$ (70,922)	$ (88,500)
Denominator:
Weighted average shares used in computing net loss per share, basic (in shares)	59,649	57,779	59,403	57,637
Weighted average shares used in computing net loss per share, diluted (in shares)	59,649	57,779	59,403	57,637
Net loss per share, basic (in usd per share)	$ (0.66)	$ (0.79)	$ (1.19)	$ (1.54)
Net loss per share attributable to common stockholders, diluted (in usd per share)	$ (0.66)	$ (0.79)	$ (1.19)	$ (1.54)