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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		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	124,709	128,306	124,505	129,870
Effect of dilutive securities - stock options	4,811	3,284	4,492	2,826
Diluted weighted average shares outstanding	129,520	131,590	128,997	132,696

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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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