Related Party Transactions - Schedule of Nature of Relationships with Related Parties (Details) - USD ($)	6 Months Ended
Mar. 31, 2026	Sep. 30, 2025
Taizhou Huadi Industrial Ltd. (“Taizhou Huadi”) [Member]
Related Party Transaction [Line Items]
Relationship with the Company	An entity 30% owned by Jueqin Wang, principal shareholder of the Company
Huashang Micro Finance Co. [Member]
Related Party Transaction [Line Items]
Relationship with the Company	An entity 19% owned by the Company
Advance from customer	$ (20,655)	$ (7,131)
Taizhou Huadi Material Technology Co. (Huadi Material) [Member]
Related Party Transaction [Line Items]
Relationship with the Company	An entity 100% owned by Jueguang Wang, Immediate family member of Jueqin Wang
Jueqin Wang [Member]
Related Party Transaction [Line Items]
Relationship with the Company	Principal shareholder of the Company
Due to related parties – noncurrent portion		(255,344)
Taizhou Huadi Material Technology Co. [Member]
Related Party Transaction [Line Items]
Accounts payable		$ (462)

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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- Definition

A description of the related party transaction, including transactions to which no amounts or nominal amounts were ascribed and such other information deemed necessary to an understanding of the effects of the transactions on the financial statements. Examples of common related party transactions are, sales, purchases and transfers of realty and personal property, services received or furnished, loans and leases to and from top management and affiliates.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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