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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2017	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised	3,000,000	80,000	18,000,000
Weighted Average Exercise Price	$ 17.81	$ 6.54	$ 7.70
Shares Net Settled for Exercise	945,162	11,996	5,408,972
Shares Withheld for Taxes	806,039	0	5,255,322
Net Shares to Employees	1,248,799	68,004	7,335,706
Weighted Average Share Price for Withholding	$ 56.53	$ 43.60	$ 25.62
Payments for Employee Stock-Based Tax Withholdings	$ 45,565	$ 0	$ 134,615	$ 46,888	$ 1,115	$ 135,433

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Represents the number of net shares distributed to employee after shares settled for exercise and withheld for taxes.

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Represents the number of net impact on number of shares settled resulting from exercise.

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The price per shares for withholding for taxes.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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