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Cash, Cash Equivalents, and Investments - Components of Cash and Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Cash and cash equivalents
Cash	$ 136,274	$ 184,308
Money market funds	189,759	139,870
U.S. Treasury securities	0	14,988
Total cash and cash equivalents	326,033	339,166
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale investments	230,932	221,112
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale investments	57,873	45,026
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale investments	43,361	34,598
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale investments	$ 129,698	$ 141,488

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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