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Cash, Cash Equivalents, and Investments - Contractual Maturity (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Cost Basis
Due within one year	$ 180,327	$ 171,498
Due between one to five years	50,466	49,271
Cost Basis	230,793	220,769
Recorded Basis
Due within one year	180,494	171,837
Due between one to five years	50,438	49,275
Recorded Basis	$ 230,932	$ 221,112

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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