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Net Income Per Share (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012	Jan. 31, 2011
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	64,153	81,240	64,935	82,492
Effect of dilutive securities - stock options	1,642	715	1,413	688
Diluted weighted average shares outstanding	65,795	81,955	66,348	83,180

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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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