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Stock Based Compensation (Narrative) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 06, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense $ 3,407us-gaap_ShareBasedCompensation $ 2,416us-gaap_ShareBasedCompensation        
Restricted Stock | Employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock granted, vesting period 3 years   3 years      
Common stock granted, shares 165us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acet_EmployeeMember
  214us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acet_EmployeeMember
     
Restricted Stock | Non Employee Directors            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock granted, vesting period 1 year   1 year      
Common stock granted, shares 12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acet_NonEmployeeDirectorMember
  11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= acet_NonEmployeeDirectorMember
     
Performance-vested restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock granted, shares 116us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
  131us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Upper limit of target grant, shares 203acet_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetAwardUpperLimit
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
  196acet_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetAwardUpperLimit
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Performance-vested restricted stock units, vesting percentage at the end of third year 100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
  100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Restricted Stock and Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense 3,368us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= acet_RestrictedStockAndRestrictedStockUnitsMember
2,225us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= acet_RestrictedStockAndRestrictedStockUnitsMember
  1,123us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= acet_RestrictedStockAndRestrictedStockUnitsMember
606us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= acet_RestrictedStockAndRestrictedStockUnitsMember
 
Total unrecognized compensation cost 6,779us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= acet_RestrictedStockAndRestrictedStockUnitsMember
    6,779us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= acet_RestrictedStockAndRestrictedStockUnitsMember
   
Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense $ 21us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 175us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  $ 0us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 30us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Restricted stock units | Employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock granted, shares 67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= acet_EmployeeMember
  32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= acet_EmployeeMember
     
2010 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares of common stock that may be issued           5,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= acet_Plan2010Member