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Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Jan. 31, 2018	Apr. 30, 2019
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised			4,054,000
Weighted Average Exercise Price			$ 17.44
Common Stock
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised		80,000
Weighted Average Exercise Price		$ 6.54
Shares Net Settled for Exercise		11,996
Shares Withheld for Taxes(1)		0
Net Shares to Individuals		68,004
Weighted Average Share Price for Withholding		$ 43.60
Employee Stock-Based Tax Withholding (in 000s)		$ 0
Vincent W. Mitz, the President | Common Stock
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised	3,000,000
Weighted Average Exercise Price	$ 17.81
Shares Net Settled for Exercise	945,162
Shares Withheld for Taxes(1)	806,039
Net Shares to Individuals	1,248,799
Weighted Average Share Price for Withholding	$ 56.53
Employee Stock-Based Tax Withholding (in 000s)	$ 45,565

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