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Net Earnings (Loss) Per Common Unitholders' Interest Net Earnings (Loss) Per Common Unitholders' Interest (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			0.1
Dilutive effect on earnings per share	$ 0	$ 0	$ 0

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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