Equity Incentive Plan - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2025 USD ($) shares	Oct. 31, 2025 USD ($) shares	Oct. 31, 2024 USD ($)	Oct. 31, 2025 USD ($) $ / shares shares	Oct. 31, 2024 USD ($) $ / shares	Jan. 31, 2025 USD ($) shares	Oct. 30, 2025 shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	86,990,157	86,990,157		86,990,157		197,511,756	2,070,000,000
Common stock, capital shares reserved for future issuance, increase in authorized shares per year, period of increase (in years)				10 years
Common stock, capital shares reserved for future issuance, increase in authorized shares per year, increase percentage				0.05
Share-based payment arrangement, plan modification, incremental cost | $				$ 300
Options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares				$ 13.76	$ 11.62
Exercises, aggregate intrinsic value | $				$ 48,309	$ 3,100
Options, vested in period, fair value | $				51,300	118,000
Share-based payment arrangement, nonvested award, option, cost not yet recognized, amount | $	$ 108,100	$ 108,100		108,100
Share-based payment arrangement, accelerated cost | $	81,800
Capitalized stock-based compensation | $	$ 900	2,127	$ 686	3,522	1,782
Total stock-based compensation expense, net of amounts capitalized | $		$ 99,182	$ 24,574	$ 135,091	$ 59,487
Share-based compensation arrangement by share-based payment award, shares issued in period (in shares)	934,353
Stock options issued and outstanding
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	39,739,322	39,739,322		39,739,322		40,971,097
Award vesting period (in years)				4 years
Award expiration period (in years)				10 years
Expected dividend yield		0.00%	0.00%	0.00%	0.00%
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition (in years)				2 years 3 months 18 days
Restricted Stock Units with Performance Conditions
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award expiration period (in years)				10 years
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition (in years)				3 years 4 months 24 days
Share-based compensation arrangement by share-based payment award, award requisite service period (in years)				4 years
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount | $	$ 108,200	$ 108,200		$ 108,200
Restricted Stock Units with Service-Only Conditions
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition (in years)				3 years 8 months 12 days
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount | $	41,000	41,000		$ 41,000
Total stock-based compensation expense, net of amounts capitalized | $				$ 2,900
Employee Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average number of shares, common stock subject to repurchase or cancellation (in shares)				9,543		49,761
Common stock subject to repurchase or cancellation, liability | $	$ 200	$ 200		$ 200		$ 1,000
Share-based compensation arrangement by share-based payment award, shares issued in period (in shares)				0
Class A common stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	2,000,000,000	2,000,000,000		2,000,000,000
Class B common stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	50,000,000	50,000,000		50,000,000
2025 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	82,887,502	82,887,502		82,887,502
2025 Equity Incentive Plan | Class A common stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance, new shares (in shares)	35,000,000	35,000,000		35,000,000
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares)	38,567,992	38,567,992		38,567,992
2015 Equity Incentive Plan | Class A common stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance, existing shares (in shares)	47,887,502	47,887,502		47,887,502
2025 Employee Stock Purchase Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee stock purchase plan, contingent increase, percentage	0.01	0.01		0.01
2025 Employee Stock Purchase Plan | Class A common stock | Employee Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares)	5,000,000	5,000,000		5,000,000