Net Earnings (Loss) Per Common Unitholders' Interest (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Oct. 31, 2012	Oct. 31, 2011
Net Earnings (Loss) Per Common Unitholders' Interest [Abstract]
Common unitholders' interest in net earnings (loss)	$ (17,481)	$ (32,278)
Weighted average common units outstanding	79,013,300	75,966,400
Weighted Average Number of Shares Outstanding, Basic and Diluted	79,013,300	75,966,400
Basic and diluted net earnings (loss) per common unitholders' interest	$ (0.22)	$ (0.42)

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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+ Details