Net Income (Loss) Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 31, 2025	Apr. 30, 2025	Jul. 31, 2024	Apr. 30, 2024	Jul. 31, 2025	Jul. 31, 2024
Numerator:
Net income (loss)	$ 1,584	$ (22,555)	$ (86,097)	$ (28,736)	$ (20,971)	$ (114,833)
Denominator:
Weighted-average shares used in computing net income (loss) per share, basic (in shares)	536,169		568,042		542,208	568,973
Weighted-average shares used in computing net income (loss) per share, diluted (in shares)	542,865		568,042		542,208	568,973
Net income (loss) per share, basic (in dollars per share)	$ 0.00		$ (0.15)		$ (0.04)	$ (0.20)
Net income (loss) per share, diluted (in dollars per share)	$ 0.00		$ (0.15)		$ (0.04)	$ (0.20)
Class A
Numerator:
Net income (loss)	$ 1,355		$ (73,600)		$ (17,933)	$ (98,192)
Denominator:
Weighted-average shares used in computing net income (loss) per share, basic (in shares)	458,716		485,589		463,650	486,520
Dilutive potential common shares from outstanding equity awards (in shares)	6,696		0
Weighted-average shares used in computing net income (loss) per share, diluted (in shares)	465,412		485,589		463,650	486,520
Net income (loss) per share, basic (in dollars per share)	$ 0.00		$ (0.15)		$ (0.04)	$ (0.20)
Net income (loss) per share, diluted (in dollars per share)	$ 0.00		$ (0.15)		$ (0.04)	$ (0.20)
Class B
Numerator:
Net income (loss)	$ 229		$ (12,497)		$ (3,038)	$ (16,641)
Denominator:
Weighted-average shares used in computing net income (loss) per share, basic (in shares)	77,453		82,453		78,558	82,453
Dilutive potential common shares from outstanding equity awards (in shares)	0		0
Weighted-average shares used in computing net income (loss) per share, diluted (in shares)	77,453		82,453		78,558	82,453
Net income (loss) per share, basic (in dollars per share)	$ 0.00		$ (0.15)		$ (0.04)	$ (0.20)
Net income (loss) per share, diluted (in dollars per share)	$ 0.00		$ (0.15)		$ (0.04)	$ (0.20)