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Investments - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jul. 31, 2022	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Fair Value, Separate Account Investment [Line Items]
Unrealized loss position, less than 12 months		$ 24,800,000	$ 23,300,000
Unrealized loss position, more than 12 months		42,000,000	0
Available-for-sale, realized gain (loss)		0	0	$ 0
Strategic Investment Of Technology Company
Fair Value, Separate Account Investment [Line Items]
Payments for strategic investment	$ 40,000,000
Gain (loss) on investment		(11,700,000)
Equity securities		28,300,000
Fair Value
Fair Value, Separate Account Investment [Line Items]
Equity securities		$ 171,975,000	$ 168,784,000
Fair Value \| Strategic Investment Of Technology Company
Fair Value, Separate Account Investment [Line Items]
Ownership percentage (as a percent)		1.00%