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Earnings Per Common Share (Details)	3 Months Ended		9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Earnings Per Common Share [Abstract]
Weighted average common shares outstanding for basic earnings per share	52,879,877	55,829,122	54,162,411	55,079,700
Stock options	90,480	112,267	50,252	105,481
Weighted average common shares outstanding for diluted earnings per share	52,970,357	55,941,389	54,212,663	55,185,181
Antidilutive stock options outstanding			400,000	886,000

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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