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Fair Value Measurements (Summary of Valuation of Financial Assets and Liabilities) (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contracts-assets $ 424us-gaap_ForeignCurrencyContractAssetFairValueDisclosure [1] $ 87us-gaap_ForeignCurrencyContractAssetFairValueDisclosure [2]
Foreign currency contracts-liabilities 2,635us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure [3] 128us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure [4]
Derivative liability for interest rate swap 439us-gaap_InterestRateDerivativeLiabilitiesAtFairValue [5] 437us-gaap_InterestRateDerivativeLiabilitiesAtFairValue [6]
Contingent consideration 7,373acet_BusinessAcquisitionContingentConsiderationFairValue [7] 9,904acet_BusinessAcquisitionContingentConsiderationFairValue [8]
Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 6,253us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BankTimeDepositsMember		 1,372us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BankTimeDepositsMember
Investments 1,834us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BankTimeDepositsMember		 746us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BankTimeDepositsMember
Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contracts-assets    [1]    [2]
Foreign currency contracts-liabilities    [3]    [4]
Derivative liability for interest rate swap    [5]    [6]
Contingent consideration    [7]    [8]
Quoted Prices in Active Markets (Level 1) | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents      
Investments      
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contracts-assets 424us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1] 87us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]
Foreign currency contracts-liabilities 2,635us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [3] 128us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [4]
Derivative liability for interest rate swap 439us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [5] 437us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [6]
Contingent consideration    [7]    [8]
Significant Other Observable Inputs (Level 2) | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 6,253us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 1,372us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Investments 1,834us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 746us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contracts-assets    [1]    [2]
Foreign currency contracts-liabilities    [3]    [4]
Derivative liability for interest rate swap    [5]    [6]
Contingent consideration 7,373acet_BusinessAcquisitionContingentConsiderationFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [7] 9,904acet_BusinessAcquisitionContingentConsiderationFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [8]
Significant Unobservable Inputs (Level 3) | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents      
Investments      
[1] Included in "Other receivables" in the accompanying Condensed Consolidated Balance Sheet as of March 31, 2015.
[2] Included in "Other receivables" in the accompanying Condensed Consolidated Balance Sheet as of June 30, 2014.
[3] Included in "Accrued expenses" in the accompanying Condensed Consolidated Balance Sheet as of March 31, 2015.
[4] Included in "Accrued expenses" in the accompanying Condensed Consolidated Balance Sheet as of June 30, 2014.
[5] $28 included in "Accrued expenses" and $411 included in "Long-term liabilities" in the accompanying Condensed Consolidated Balance Sheet as of March 31, 2015.
[6] Included in "Long-term liabilities" in the accompanying Condensed Consolidated Balance Sheet as of June 30, 2014.
[7] $2,937 included in "Accrued expenses" and $4,436 included in "Long-term liabilities" in the accompanying Condensed Consolidated Balance Sheet as of March 31, 2015.
[8] $4,500 included in "Accrued expenses" and $5,404 included in "Long-term liabilities" in the accompanying Condensed Consolidated Balance Sheet as of June 30, 2014.