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Investments - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jan. 31, 2022	Jul. 31, 2021	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Fair Value, Separate Account Investment [Line Items]
Available-for-sale, realized gain (loss)			$ 0	$ 0	$ 0
Income (loss) from equity method investments	$ 49,900,000
Strategic Investment Of Technology Company
Fair Value, Separate Account Investment [Line Items]
Payments for strategic investment		$ 75,000,000
Lock up agreement term		180 days
Gain (loss) on investment			26,300,000
Strategic Investment Of Software Company
Fair Value, Separate Account Investment [Line Items]
Payments for strategic investment	100,000,000
Gain (loss) on investment			(32,500,000)
Strategic Investment Of Private Company
Fair Value, Separate Account Investment [Line Items]
Payment for alternative investment	75,000,000
Fair Value
Fair Value, Separate Account Investment [Line Items]
Equity securities	168,784,000		168,784,000	$ 0
Equity investment	93,400,000		93,400,000
Fair Value \| Strategic Investment Of Technology Company
Fair Value, Separate Account Investment [Line Items]
Equity securities	$ 101,300,000		$ 101,300,000
Ownership percentage	1.00%		1.00%
Fair Value \| Strategic Investment Of Software Company
Fair Value, Separate Account Investment [Line Items]
Equity securities	$ 67,500,000		$ 67,500,000
Ownership percentage	2.00%		2.00%