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Earnings Per Common Share (Details)	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Earnings Per Common Share [Abstract]
Weighted average common shares outstanding for basic earnings per share	54,992,184	53,621,890
Stock options	21,823	86,214
Weighted average common shares outstanding for diluted earnings per share	55,014,007	53,708,104
Antidilutive stock options outstanding	778,725,000	909,000,000

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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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