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Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jan. 31, 2018	Jan. 31, 2019
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised		294,000
Weighted Average Exercise Price		$ 17.74
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

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

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Represents the number of shares withheld for taxes.

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Amount of Tax Expenses Paid by Company releated to the Share-based Compensation to the taxing authority.

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

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 718
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