Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Sep. 28, 2018	Jan. 01, 2018
Document and Entity Information
Entity Registrant Name	ARC Group Worldwide, Inc.
Entity Central Index Key	0000826326
Document Type	10-K
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 18.8
Entity Common Stock, Shares Outstanding		23,349,478
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY