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Net Income Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Earnings Per Share [Abstract]
Weighted average common shares outstanding	230,798	231,478	232,343	231,086
Effect of dilutive securities - stock options	9,862	9,882	10,400	8,990
Weighted average common and dilutive potential common shares outstanding	240,660	241,360	242,743	240,076

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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