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BALANCE SHEET COMPONENTS - Short-Term Investments (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Jul. 31, 2017	[1]
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Due within 1 year	$ 153,044
Due after 1 year through 3 years	80,442
Total	$ 233,486	$ 210,694
[1] See Note 3 for a summary of adjustments related to the adoption of the new revenue recognition standard.

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- Definition

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

+ References

No definition available.

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- References

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- Definition

Fair value of available-for-sale debt securities maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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- Definition

Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

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