Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2015	Feb. 04, 2016
Document and Entity Information
Entity Registrant Name	HAYNES INTERNATIONAL INC
Entity Central Index Key	0000858655
Document Type	10-Q
Document Period End Date	Dec. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		12,481,549
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1