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Net Income Per Share - Reconciliation of basic weighted shares outstanding to diluted weighted average shares outstanding (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	125,270	126,596	124,755	128,794
Effect of dilutive securities - stock options	5,260	3,855	4,747	3,165
Diluted weighted average shares outstanding	130,530	130,451	129,502	131,959

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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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