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Stock Options (Tables)
3 Months Ended
Jul. 31, 2014
Fair Value Disclosures [Abstract]  
Schedule of Stock Options

    Number of Options   Weighted Average Exercise Price
$
  Weighted Average Remaining Contractual Life (years)   Aggregate Intrinsic Value
$
  Outstanding and exercisable, July 31, 2014       4,000,000       0.70       1.62       —