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Schedule of Long Lived Assets by Geographical Areas (Details) (USD $)
 9 Months Ended
Jan. 31, 2015
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 1 $ 7,013,630cpah_ScheduleOfLongLivedAssetsByGeographicalAreasZeroTwoSevenZeroZeroZeroMEightZeroDZQZZeroBdfy
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 2 8,230,891cpah_ScheduleOfLongLivedAssetsByGeographicalAreasZeroTwoSevenZeroZeroZerofNOneZeroCSevenytLvhd
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 3 218,748cpah_ScheduleOfLongLivedAssetsByGeographicalAreasZeroTwoSevenZeroZeroZeroSevenSevenSEightwqSixrRRzQ
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 4 44,816cpah_ScheduleOfLongLivedAssetsByGeographicalAreasZeroTwoSevenZeroZeroZeroNwmTJpKxKWGG
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 5 7,232,378cpah_ScheduleOfLongLivedAssetsByGeographicalAreasZeroTwoSevenZeroZeroZeroDncVTNineRnRTRw
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 6 $ 8,275,707cpah_ScheduleOfLongLivedAssetsByGeographicalAreasZeroTwoSevenZeroZeroZeroVkSixtwGFourNTlOneB