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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Income Tax Holiday [Line Items]          
Gross unrecognized tax benefits $ 39.4us-gaap_UnrecognizedTaxBenefits   $ 39.4us-gaap_UnrecognizedTaxBenefits   $ 41.5us-gaap_UnrecognizedTaxBenefits
Gross unrecognized tax benefits that would impact the effective tax rate if recognized 25.6us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate   25.6us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate   25.4us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Net change in liability for unrecognized tax benefits for uncertain tax positions     (2.1)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease    
Anticipated liability decrease for unrecognized tax benefits for uncertain tax positions 6.6prxl_AnticipatedLiabilityDecreaseForUnrecognizedTaxBenefitsForUncertainTaxPositions   6.6prxl_AnticipatedLiabilityDecreaseForUnrecognizedTaxBenefitsForUncertainTaxPositions    
Interest and penalties included in liability for unrecognized tax benefits 5.5us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued   5.5us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued    
Interest and penalties included in income tax expense           
Effective income tax rate 28.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations     34.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations