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BALANCE SHEET COMPONENTS - Short-Term Investments (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Jul. 31, 2018
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Due within one year	$ 373,305
Due in one to two years	122,328
Total	$ 495,633	$ 628,328

X

- Definition

Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Three, Fair Value

+ References

No definition available.

+ Details

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X

- References

No definition available.

+ Details

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26626-111562

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