Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details) - 3 months ended Jul. 31, 2015 - yr	Total
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 1	1.66%
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 2	1.65%
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 3	90.23%
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 4	58.20%
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 5	3.7
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 6	3.7
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 7	0.00%
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 8	0.00%

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