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Stockholder's Equity (Details 3) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended
	Jan. 31, 2018	Oct. 31, 2016	Jul. 31, 2016	Jul. 31, 2018	Jul. 31, 2017
Number Of Options [Roll Forward]
Exercise of stock options, net of repurchased shares (in shares)	(80,000)	(18,000,000)	(2,260,000)
Weighted Average Exercise Price [Roll Forward]
Exercises (in dollars per share)	$ 6.54	$ 7.70	$ 9.32
Stock Options
Number Of Options [Roll Forward]
Outstanding at July 31, 2017 (in shares)				18,774,000
Grants of options (in shares)				2,383,000
Exercise of stock options, net of repurchased shares (in shares)				(3,202,000)
Forfeitures or expirations (in shares)				(158,000)
Outstanding at July 31, 2018 (in shares)				17,797,000	18,774,000
Exercisable at July 31, 2018 (in shares)				12,281,000
Vested and expected to vest at July 31, 2018 (in shares)				17,232,000
Weighted Average Exercise Price [Roll Forward]
Outstanding at July 31, 2017 (in dollars per share)				$ 17.14
Grants of options (in dollars per share)				36.78
Exercises (in dollars per share)				14.05
Forfeitures or expirations (in dollars per share)				20.93
Outstanding at July 31, 2018 (in dollars per share)				20.29	$ 17.14
Exercisable at July 31, 2018 (in dollars per share)				17.41
Vested and expected to vest at July 31, 2018 (in dollars per share)				$ 20.06
Weighted-Average Remaining Contractual Term [Roll Forward]
Outstanding at July 31, 2017					6 years 5 months 23 days
Outstanding at July 31, 2018				6 years 2 months 9 days
Exercisable at July 31, 2018				5 years 6 months 4 days
Vested and expected to vest at July 31, 2018				6 years 1 month 17 days
Aggregate Intrinsic Value [Roll Forward]
Outstanding at July 31, 2017				$ 269,449
Outstanding at July 31, 2018				660,268	$ 269,449
Exercisable at July 31, 2018				490,951
Vested and expected to vest at July 31, 2018				$ 643,206

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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