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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jul. 31, 2019
Cash equivalents:
Cash equivalents	$ 43,874
Short-term investments:
Short-term investments	308,380	$ 286,162
Cash equivalents and short-term investments, estimated fair value	352,254	341,198
Fair Value, Measurements, Recurring
Cash equivalents:
Cash equivalents	43,874
Short-term investments:
Short-term investments	308,380	286,162
Cash equivalents and short-term investments, estimated fair value	352,254	341,198
Fair Value, Measurements, Recurring | Level I
Cash equivalents:
Cash equivalents	42,374
Short-term investments:
Short-term investments	0	0
Cash equivalents and short-term investments, estimated fair value	42,374	55,036
Fair Value, Measurements, Recurring | Level II
Cash equivalents:
Cash equivalents	1,500
Short-term investments:
Short-term investments	308,380	286,162
Cash equivalents and short-term investments, estimated fair value	309,880	286,162
Fair Value, Measurements, Recurring | Level III
Cash equivalents:
Cash equivalents	0
Short-term investments:
Short-term investments	0	0
Cash equivalents and short-term investments, estimated fair value	0	0
Money market funds
Cash equivalents:
Cash equivalents	42,374	55,036
Money market funds | Fair Value, Measurements, Recurring
Cash equivalents:
Cash equivalents	42,374	55,036
Money market funds | Fair Value, Measurements, Recurring | Level I
Cash equivalents:
Cash equivalents	42,374	55,036
Money market funds | Fair Value, Measurements, Recurring | Level II
Cash equivalents:
Cash equivalents	0	0
Money market funds | Fair Value, Measurements, Recurring | Level III
Cash equivalents:
Cash equivalents	0	0
U.S. government agency securities
Cash equivalents:
Cash equivalents	1,500
Short-term investments:
Short-term investments	112,980	64,646
U.S. government agency securities | Fair Value, Measurements, Recurring
Cash equivalents:
Cash equivalents	1,500
Short-term investments:
Short-term investments	112,980	64,646
U.S. government agency securities | Fair Value, Measurements, Recurring | Level I
Cash equivalents:
Cash equivalents	0
Short-term investments:
Short-term investments	0	0
U.S. government agency securities | Fair Value, Measurements, Recurring | Level II
Cash equivalents:
Cash equivalents	1,500
Short-term investments:
Short-term investments	112,980	64,646
U.S. government agency securities | Fair Value, Measurements, Recurring | Level III
Cash equivalents:
Cash equivalents	0
Short-term investments:
Short-term investments	0	0
U.S. treasury securities
Short-term investments:
Short-term investments	72,168	125,281
U.S. treasury securities | Fair Value, Measurements, Recurring
Short-term investments:
Short-term investments	72,168	125,281
U.S. treasury securities | Fair Value, Measurements, Recurring | Level I
Short-term investments:
Short-term investments	0	0
U.S. treasury securities | Fair Value, Measurements, Recurring | Level II
Short-term investments:
Short-term investments	72,168	125,281
U.S. treasury securities | Fair Value, Measurements, Recurring | Level III
Short-term investments:
Short-term investments	0	0
Corporate debt securities
Short-term investments:
Short-term investments	123,232	96,235
Corporate debt securities | Fair Value, Measurements, Recurring
Short-term investments:
Short-term investments	123,232	96,235
Corporate debt securities | Fair Value, Measurements, Recurring | Level I
Short-term investments:
Short-term investments	0	0
Corporate debt securities | Fair Value, Measurements, Recurring | Level II
Short-term investments:
Short-term investments	123,232	96,235
Corporate debt securities | Fair Value, Measurements, Recurring | Level III
Short-term investments:
Short-term investments	$ 0	$ 0

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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), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26626-111562

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