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Fair Value Measurements - Fair Value of Available-for-Sale Marketable Securities by Remaining Contractual Maturities (Details) $ in Thousands	Apr. 30, 2019 USD ($)
Fair Value Disclosures [Abstract]
Due in one year or less	$ 515,648
Due in one to two years	184,683
Total available-for-sale securities	$ 700,331

X

- Definition

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 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.

+ References

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

+ References

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