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Property and equipment - Narrative (Detail) (USD $)	6 Months Ended		55 Months Ended
Property and equipment - Narrative (Detail) (USD $)	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013
Property, Plant and Equipment [Line Items]
Depreciation	$ 16,782	$ 20,634	$ 94,396

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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