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Stock Repurchases (Details Textual) - USD ($) $ in Millions	3 Months Ended	79 Months Ended
	Oct. 31, 2018	Apr. 30, 2018	Sep. 22, 2011
Remittance to taxing authorities under statutory withholding	$ 0.0
Number of stock options exercised	62,000
Stock Repurchase Program 2011
Stock Repurchase Program Additional Number Of Shares Authorized Approved			80,000,000
Stock Repurchased and Retired During Period, Shares		106,913,602
Number of shares available for repurchase under stock repurchase program	89,086,398
Common Stock | Stock Repurchase Program 2011
Common stock authorized for repurchase (in shares)			196,000,000

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- Definition

The number additional shares approved under company's stock repurchase program by the entity's board of directors.

+ References

No definition available.

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- Definition

The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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- Definition

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

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased and retired during the period.

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