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CONSOLIDATED BALANCE SHEETS [Parentheticals] (USD $) | Jul. 31, 2011 | Jul. 31, 2010
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Statement Of Financial Position [Abstract] |  |
Common stock, no par value (in dollars per share) |  |
Common stock, shares authorized | 180,000,000 | 180,000,000
Common stock, shares issued | 66,005,517 | 84,363,063
Common stock, shares outstanding | 66,005,517 | 84,363,063

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