Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2016	Aug. 22, 2016	Dec. 31, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	ACETO CORP
Entity Central Index Key	0000002034
Trading Symbol	acet
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	No
Entity Common Stock Shares Outstanding		29,648,664
Entity Public Float			$ 774,640,722
Document Type	10-K
Document Period End Date	Jun. 30, 2016
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY