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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended
	Jan. 31, 2018	Oct. 31, 2016	Jul. 31, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]
Options Exercised	80,000	18,000,000	2,260,000
Exercise Price	$ 6.54	$ 7.70	$ 9.32
Shares Net Settled for Exercise	11,996	5,408,972	821,296
Net Shares to Employee	0	5,255,322	586,304
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	68,004	7,335,706	852,400
Share Price for Withholding	$ 43.60	$ 25.62	$ 25.65
Tax Withholding (in 000's)	$ 0	$ 134,615	$ 15,039	$ 1,115	$ 135,433	$ 15,039

X

- Definition

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

+ References

No definition available.

+ Details

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No definition available.

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

The price per shares for withholding for taxes.

+ References

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- Definition

Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
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-Section 45
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X

- Definition

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

+ References

No definition available.

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X

- Definition

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.

+ References

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- Definition

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

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