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Schedule of Allocation of Share Based Compensation Costs for Deferred Share Units (Details) (USD $)
 9 Months Ended
Jan. 31, 2015
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 1 $ 0cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoThreeFPzSixstOnevkCSix
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 2 6,667cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoLTTwoLSixlZFdsVy
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 3 1,667cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoOneSevenNineThreeSKpSevenHEightvq
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 4 20,001cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwovdnEightPHrzXvTr
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 5 2,082cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwovfNinevTThreeFSFourSkm
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 6 2,082cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoVFdQJlKqkvcf
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 7 6,246cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoxtqSVSmcxWRC
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 8 6,246cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoCTThreePwrWqWMSixZ
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 9 41,974cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoCDFourZnfXLFoursTm
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 10 45,507cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoZeroBmbCvyxTspT
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 11 292,709cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoSixTwomTWyXPThreehrNine
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 12 345,834cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwotfXrdKzKkWXW
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 13 44,056cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoEightHnfsFNineNineTLZeroFive
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 14 54,256cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoEightRMEightsycXOneSevennH
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 15 300,622cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwoylVMNfwCClqFive
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 16 $ 372,081cpah_ScheduleOfAllocationOfShareBasedCompensationCostsForDeferredShareUnitsZeroTwoSevenZeroZeroThreeOneNineTwofFourrGSixKFourGThreedzs