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Income Taxes (Details 1)	12 Months Ended
Income Taxes (Details 1)	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Federal statutory rate	(34.00%)	(34.00%)	(34.00%)
Imputed interest income on intercompany receivables from foreign subsidiaries	5.00%	3.00%	2.00%
Nondeductible or non-taxable items	4.00%	(4.00%)	(6.00%)
Change in Canadian NOL carryforwards due to future tax rate changes	0.00%	20.00%	0.00%
Other temporary differences	13.00%	18.00%	3.00%
Change in valuation allowance	12.00%	(3.00%)	35.00%
Effective tax rate	0.00%	0.00%	0.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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