Annual report pursuant to Section 13 and 15(d)

Supplemental disclosure for statement of cash flows (Detail)

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Supplemental disclosure for statement of cash flows (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Income Taxes Paid $ 70 $ 107 $ 186