Stock-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($)	3 Months Ended		6 Months Ended		18 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022	Jan. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	$ 52,846,000	$ 41,001,000	$ 72,631,000	$ 108,395,000
Share-based payment arrangement, plan modification, incremental cost	2,000,000		4,000,000
Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, plan modification, incremental cost					$ 2,200,000
ESPP shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	2,900,000	3,800,000	5,900,000	6,500,000
Share-based payment arrangement, plan modification, incremental cost	100,000	$ 200,000	300,000	$ 200,000
Cost not yet recognized amount	$ 0		$ 0