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Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details)
 9 Months Ended
Jan. 31, 2015
Y
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 1 1.53%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeroVVBcSixKTwoHBlfb
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 2 1.58%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeroPTTEightNineTrSixndRSix
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 3 1.67%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZerokSixBTwoXFivepVKwqr
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 4 1.61%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeroEightZeroZSevengMrgTQdy
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 5 54.50%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeroMThreeKZtgpKntKv
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 6 70.32%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeroThreeZeroGfSevenJKxLnCSix
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 7 57.50%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeroNCPLwQJCZCfS
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 8 68.09%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZerohLmtzTZFiveVTgThree
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 9 3.7cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeromZnCqBHsLCFourM
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 10 3.7cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeroTwobGCgdqJmOnenD
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 11 3.7cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeromyvVkvSmWOneThreey
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 12 3.7cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeroDLLhpQCTDXLg
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 13 0.00%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeromRxNTckJMTbG
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 14 0.00%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZerokhsdXkJFTSevenJX
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 15 0.00%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeroCqZerobGpcvSevenBLz
Common Stock Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 16 0.00%cpah_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSevenZeroZeroZeroOneJhycRBTvLcD