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Cash Equivalents and Short Term Investments - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jul. 31, 2022 USD ($) investment	Jul. 31, 2022 USD ($) investment	Jul. 31, 2021 USD ($)	Jan. 31, 2022 USD ($) investment
Cash and Cash Equivalents [Abstract]
Reclassify from accumulated other comprehensive income (loss)		$ 0	$ 0
Contractual maturity in one year	$ 118,500,000	118,500,000		$ 108,300,000
Contractual maturity greater than one year	$ 27,300,000	$ 27,300,000		$ 2,000,000
Number of short-term investments in unrealized loss position | Investment | investment	35	35		25
Short-term investments estimated fair value	$ 122,100,000	$ 122,100,000		$ 71,800,000
Impairment of short-term investments	$ 0	$ 0

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Short-Term Investments, Contractual Maturity In One Year

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Short term investments estimated fair value.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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