Cash Equivalents and Investments - Schedule of Contractual Maturities of Short-term Investments (Details) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Amortized Cost
Amortized Cost	$ 2,369,404	$ 2,405,617
Estimated Fair Value
Estimated fair value	2,338,968	2,393,880
Short-term Investments
Amortized Cost
Amortized cost, due within one year	1,743,049
Amortized cost, due between one to five years	548,343
Amortized Cost	2,291,392	2,253,394
Estimated Fair Value
Estimated fair value, due within one year	1,720,573
Estimated fair value, due between one to five years	540,383
Estimated fair value	$ 2,260,956	$ 2,241,657

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 second through fifth 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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Fair value 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 second through fifth 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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