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Stock Repurchases (Details Textual) - shares	6 Months Ended	232 Months Ended
	Jan. 31, 2021	Jan. 31, 2021	Sep. 22, 2011
Number of stock options exercised	889,000
Stock Repurchase Program 2011
Stock Repurchase Program Additional Number Of Shares Authorized Approved			80,000,000
Stock Repurchased and Retired During Period, Shares		114,549,198
Number of shares available for repurchase under stock repurchase program	81,450,802	81,450,802
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.

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- Definition

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

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- Definition

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

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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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