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Cash Equivalents and Short-term Investments Schedule of Contractual Maturities of Short-term Investments (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Amortized Cost
Amortized cost, due within one year	$ 881,779	$ 265,396
Estimated Fair Value
Estimated fair value, due within one year	$ 882,976	$ 265,374

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

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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), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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