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Basis of Presentation (Policies)	6 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2019
Basis of Presentation
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of Haynes International, Inc. and directly or indirectly wholly-owned subsidiaries (collectively, the “Company”). All intercompany transactions and balances are eliminated.