Financial Instruments and Fair Value - Additional Information (Detail) $ in Millions	12 Months Ended
	Jan. 31, 2023 USD ($) Security	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Interest income and realized gains and losses from available-for-sale debt securities | $	$ 1.7	$ 1.7	$ 3.6
Number of debt securities with unrealized losses for more than twelve months	0
Money Market Funds [Member]
Debt Securities, Available-for-Sale [Line Items]
Number of money market funds with unrealized losses for more than twelve months	0