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Net Income Per Share (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	126,596	139,613	128,794	156,714
Effect of dilutive securities - stock options	3,855	2,452	3,165	1,734
Diluted weighted average shares outstanding	130,451	142,065	131,959	158,448

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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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