Cash Equivalents and Investments - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 31, 2023	Jan. 31, 2023
Debt Securities, Available-for-sale, Unrealized Loss Position
Contractual maturities of available-for-sale debt securities, maximum	36 months
Prepaid Expenses and Other Current Assets
Debt Securities, Available-for-sale, Unrealized Loss Position
Interest receivable, current	$ 26.3	$ 19.4