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Stock Repurchases (Details Textual) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended	223 Months Ended
	Oct. 31, 2018	Apr. 30, 2020	Apr. 30, 2020	Jul. 31, 2019	Sep. 22, 2011
Stock Repurchased and Retired During Period, Shares	7,635,596
Stock Repurchased and Retired During Period, Value	$ 365.0
Stock Repurchased and Retired During Period Cost Per Share				$ 47.81
Number of stock options exercised		6,898,000
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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Represents the price per share paid to acquire company's common stock under stock repurchase program.

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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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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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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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