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Fair Value Measurements - Fair Value Hierarchy for Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Assets/(Liabilities)          
Contingent Consideration $ 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 $ 16us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 $ 866us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 $ 16us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1  
Fair Value, Inputs, Level 1 [Member]          
Assets/(Liabilities)          
Available-for-sale securities 2,569har_FairValueAssetsMeasuredOnRecurringBasisAvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
  2,569har_FairValueAssetsMeasuredOnRecurringBasisAvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
  2,472har_FairValueAssetsMeasuredOnRecurringBasisAvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Foreign exchange contracts 0har_FairValueAssetsMeasuredOnRecurringBasisForeignExchangeContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
  0har_FairValueAssetsMeasuredOnRecurringBasisForeignExchangeContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
  0har_FairValueAssetsMeasuredOnRecurringBasisForeignExchangeContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Pension assets 3,676har_FairValueAssetsMeasuredOnRecurringPensionAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
  3,676har_FairValueAssetsMeasuredOnRecurringPensionAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
  6,641har_FairValueAssetsMeasuredOnRecurringPensionAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Contingent consideration     0har_BusinessAcquisitionContingentConsiderationAcquisitionsAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
  0har_BusinessAcquisitionContingentConsiderationAcquisitionsAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Net asset/(liability) 6,245har_AssetsLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
  6,245har_AssetsLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
  9,113har_AssetsLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]          
Assets/(Liabilities)          
Available-for-sale securities 0har_FairValueAssetsMeasuredOnRecurringBasisAvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
  0har_FairValueAssetsMeasuredOnRecurringBasisAvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
  0har_FairValueAssetsMeasuredOnRecurringBasisAvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Foreign exchange contracts 140,685har_FairValueAssetsMeasuredOnRecurringBasisForeignExchangeContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
  140,685har_FairValueAssetsMeasuredOnRecurringBasisForeignExchangeContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
  (21,283)har_FairValueAssetsMeasuredOnRecurringBasisForeignExchangeContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Pension assets 0har_FairValueAssetsMeasuredOnRecurringPensionAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
  0har_FairValueAssetsMeasuredOnRecurringPensionAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
  0har_FairValueAssetsMeasuredOnRecurringPensionAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Contingent consideration     0har_BusinessAcquisitionContingentConsiderationAcquisitionsAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
  0har_BusinessAcquisitionContingentConsiderationAcquisitionsAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Net asset/(liability) 140,685har_AssetsLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
  140,685har_AssetsLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
  (21,283)har_AssetsLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]          
Assets/(Liabilities)          
Available-for-sale securities 0har_FairValueAssetsMeasuredOnRecurringBasisAvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
  0har_FairValueAssetsMeasuredOnRecurringBasisAvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
  0har_FairValueAssetsMeasuredOnRecurringBasisAvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Foreign exchange contracts 0har_FairValueAssetsMeasuredOnRecurringBasisForeignExchangeContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
  0har_FairValueAssetsMeasuredOnRecurringBasisForeignExchangeContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
  0har_FairValueAssetsMeasuredOnRecurringBasisForeignExchangeContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Pension assets 0har_FairValueAssetsMeasuredOnRecurringPensionAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
  0har_FairValueAssetsMeasuredOnRecurringPensionAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
  0har_FairValueAssetsMeasuredOnRecurringPensionAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Contingent consideration     (15,602)har_BusinessAcquisitionContingentConsiderationAcquisitionsAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
  (7,328)har_BusinessAcquisitionContingentConsiderationAcquisitionsAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Net asset/(liability) $ (15,602)har_AssetsLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
  $ (15,602)har_AssetsLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
  $ (7,328)har_AssetsLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member