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Legal, Environmental and Other Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2015
item
Sep. 30, 2014
Legal, Environmental and Other Contingencies    
Accrual for post-closure monitoring and maintenance activities 823us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCosts $ 823us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCosts
Welding rod-related injuries | Pending litigation    
Legal, Environmental and Other Contingencies    
Number of actions in which the entity is involved 2us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hayn_WeldingRodRelatedInjuriesMember		  
Asbestos in facilities | Pending litigation    
Legal, Environmental and Other Contingencies    
Number of actions in which the entity is involved 2us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hayn_AsbestosInFacilitiesMember		  
Site contingency accrual    
Legal, Environmental and Other Contingencies    
Number of areas of concern that required investigation 1hayn_NumberOfAreasOfConcernUnderFacilityInvestigation
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hayn_SiteContingencyAccrualMember		  
Number of solid waste management units evaluated under RCRA, as required by IDEM 1hayn_NumberOfSolidWasteManagementUnitsForFurtherEvaluationRequirementByIDEM
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hayn_SiteContingencyAccrualMember