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BALANCE SHEET COMPONENTS - Short-Term Investments (Details) - USD ($) $ in Thousands | Oct. 31, 2017 | Jul. 31, 2017 | [1]
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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 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. + Details
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