v3.8.0.1
Document and Entity Information - shares
3 Months Ended
Sep. 30, 2017
Oct. 31, 2017
Document and Entity Information [Abstract]    
Entity Registrant Name ACETO CORP  
Entity Central Index Key 0000002034  
Trading Symbol acet  
Current Fiscal Year End Date --06-30  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock Shares Outstanding   30,641,254
Document Type 10-Q  
Document Period End Date Sep. 30, 2017  
Amendment Flag false  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1