Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended
	Oct. 31, 2019	Apr. 30, 2019	Jan. 31, 2018	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised	4,000,000	3,000,000	80,000
Weighted Average Exercise Price	$ 17.81	$ 17.81	$ 6.54
Shares Net Settled for Exercise	865,719	945,162	11,996
Shares Withheld for Taxes	1,231,595	806,039	0
Net Shares to Employees	1,902,686	1,248,799	68,004
Weighted Average Share Price for Withholding	$ 82.29	$ 56.53	$ 43.60
Payments for Employee Stock-Based Tax Withholdings	$ 101,348	$ 45,565	$ 0	$ 103,451	$ 46,888	$ 1,115