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Employee Benefit Plans - Net periodic pension expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]        
Service cost - benefits earned during the period $ 739us-gaap_DefinedBenefitPlanServiceCost $ 535us-gaap_DefinedBenefitPlanServiceCost $ 2,217us-gaap_DefinedBenefitPlanServiceCost $ 1,843us-gaap_DefinedBenefitPlanServiceCost
Interest cost on benefit obligation 654us-gaap_DefinedBenefitPlanInterestCost 532us-gaap_DefinedBenefitPlanInterestCost 1,963us-gaap_DefinedBenefitPlanInterestCost 1,750us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets (707)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (476)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (2,121)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (1,751)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of net actuarial loss and prior service costs 351pahc_DefinedBenefitPlanAmortizationOfNetActuarialGainsLossesAndPriorServiceCost 249pahc_DefinedBenefitPlanAmortizationOfNetActuarialGainsLossesAndPriorServiceCost 1,053pahc_DefinedBenefitPlanAmortizationOfNetActuarialGainsLossesAndPriorServiceCost 678pahc_DefinedBenefitPlanAmortizationOfNetActuarialGainsLossesAndPriorServiceCost
Net periodic pension expense $ 1,037us-gaap_PensionExpense $ 840us-gaap_PensionExpense $ 3,112us-gaap_PensionExpense $ 2,520us-gaap_PensionExpense