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Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Oct. 31, 2019	Jan. 31, 2020
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised		5,852,000
Weighted Average Exercise Price		$ 17.74
Chief Executive Officer [Member] | Common Stock
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised	4,000,000
Weighted Average Exercise Price	$ 17.81
Shares Net Settled for Exercise	865,719
Shares Withheld for Taxes(1)	1,231,595
Net Shares to Employee	1,902,686
Weighted Average Share Price for Withholding	$ 82.29
Employee Stock-Based Tax Withholding (in 000s)	$ 101,348

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