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Earnings (loss) per common share (EPS) (Narrative) (Details)
 9 Months Ended
Jan. 31, 2015
Earnings (loss) Per Common Share (eps) 1 5,759,630cpah_EarningslossPerCommonShareepsZeroTwoSevenZeroZeroZeroCmhGhJSixyCxFourf
Earnings (loss) Per Common Share (eps) 2 4,834,230cpah_EarningslossPerCommonShareepsZeroTwoSevenZeroZeroZeroPdwZSevenNTTwoHSevenCX