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Fair Value Measurements Unobservable Inputs (Details)
 6 Months Ended
Dec. 31, 2014
Heron Acquisition [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Discount Rate 18.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= prxl_HeronAcquisitionMember
Fair Value Inputs, Probability of Achieving Financial Target 100.00%prxl_FairValueInputsProbabilityofAchievingFinancialTarget
/ us-gaap_BusinessAcquisitionAxis
= prxl_HeronAcquisitionMember
ClinIntel Acquisition [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Discount Rate 4.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= prxl_ClinIntelAcquisitionMember
Minimum [Member] | ClinIntel Acquisition [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Probability of Achieving Financial Target 12.50%prxl_FairValueInputsProbabilityofAchievingFinancialTarget
/ us-gaap_BusinessAcquisitionAxis
= prxl_ClinIntelAcquisitionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member] | ClinIntel Acquisition [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Probability of Achieving Financial Target 75.00%prxl_FairValueInputsProbabilityofAchievingFinancialTarget
/ us-gaap_BusinessAcquisitionAxis
= prxl_ClinIntelAcquisitionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember