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Fair Value Measurements (Narrative) (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 30, 2014
Mar. 31, 2011
Jun. 30, 2014
Rising Pharmaceuticals Inc.          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration at fair value $ 2,937acet_BusinessAcquisitionContingentConsiderationAmountAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= acet_RisingPharmaceuticalsIncMember
      $ 5,694acet_BusinessAcquisitionContingentConsiderationAmountAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= acet_RisingPharmaceuticalsIncMember
PACK Pharmaceuticals, LLC          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration at fair value 4,133acet_BusinessAcquisitionContingentConsiderationAmountAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= acet_PackPharmaceuticalsLlcMember
      3,797acet_BusinessAcquisitionContingentConsiderationAmountAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= acet_PackPharmaceuticalsLlcMember
France Company          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration at fair value 303acet_BusinessAcquisitionContingentConsiderationAmountAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= acet_FranceCompanyMember
      413acet_BusinessAcquisitionContingentConsiderationAmountAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= acet_FranceCompanyMember
Foreign exchange contract          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative, notional amount 54,495invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
       
Unrealized gains (losses) on hedging activities (2,517)us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
75us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
     
Interest rate swap | Cash flow hedging          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Unrealized loss recorded in accumulated other comprehensive income 439us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
       
Interest rate swap | Cash flow hedging | April 30, 2019          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative, notional amount 28,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ acet_ExpirationDateAxis
= acet_ExpirationDateApril302019Member
  25,750invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ acet_ExpirationDateAxis
= acet_ExpirationDateApril302019Member
   
Derivative, interest rate     1.63%us-gaap_DerivativeSwaptionInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ acet_ExpirationDateAxis
= acet_ExpirationDateApril302019Member
   
Derivative, expiration date     Apr. 30, 2019    
Interest rate swap | Cash flow hedging | December 31, 2015          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative, notional amount $ 4,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ acet_ExpirationDateAxis
= acet_ExpirationDateDecember312015Member
    $ 20,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ acet_ExpirationDateAxis
= acet_ExpirationDateDecember312015Member
 
Derivative, interest rate       1.91%us-gaap_DerivativeSwaptionInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ acet_ExpirationDateAxis
= acet_ExpirationDateDecember312015Member
 
Derivative, expiration date       Dec. 31, 2015