Cover - shares |
12 Months Ended | |
|---|---|---|
Sep. 30, 2025 |
Nov. 02, 2026 |
|
| Entity Addresses [Line Items] | ||
| Document Type | 20-F/A | |
| Amendment Flag | true | |
| Amendment Description | SU Group Holdings Limited (the “Company”) is filing this amendment (the “Amendment”) to its Annual Report on Form 20-F (the “Annual Report”) for the year ended September 30, 2025, previously filed with the Securities and Exchange Commission (the “SEC”) on January 16, 2026 (the “Original Filing”) , to replace the audit report of its previous auditor Marcum Asia CPAs LLP in the Original Filing with an audit report of its current auditor Guangdong Prouden CPAs GP and to include the consolidated financial statements for the years ended September 30, 2024 and 2025 audited by the current auditor. Except for (x) Part I, Introduction, Forward Looking Statements and Item 5, Operating and Financial Review and Prospects, (y) the consolidated financial statements for the years ended September 30, 2024 and 2025, and (z) the auditor’s report, no other information included in the Annual Report as originally filed is being repeated in this Amendment. This Amendment should be read together with the Original Filing, except for Part I, Item 5, the consolidated financial statements for the years ended 2024 and 2025, and the auditor’s report. Cross-references within this Amendment to items other than those in Part III are references to those items in the Original Filing. This Amendment does not otherwise update the disclosures set forth in the Original Filing, including the consolidated financial statements for the year ended September 30, 2023. As required by Rule 12b-15 of the Securities and Exchange Act of 1934, as amended, the Company is filing or furnishing the certifications required under Section 302 and Section 906 of the Sarbanes-Oxley Act of 2002 as exhibits to this Amendment. | |
| Document Registration Statement | false | |
| Document Annual Report | true | |
| Document Transition Report | false | |
| Document Shell Company Report | false | |
| Document Period End Date | Sep. 30, 2025 | |
| Document Fiscal Period Focus | FY | |
| Document Fiscal Year Focus | 2025 | |
| Current Fiscal Year End Date | --09-30 | |
| Entity File Number | 001-41927 | |
| Entity Registrant Name | SU Group Holdings Limited | |
| Entity Central Index Key | 0001969863 | |
| Entity Incorporation, State or Country Code | E9 | |
| Entity Address, Address Line One | 7th Floor, The Rays | |
| Entity Address, Address Line Two | No. 71 Hung To Road, Kwun Tong | |
| Entity Address, City or Town | Kowloon | |
| Entity Address, Country | HK | |
| Entity Address, Postal Zip Code | 000000 | |
| Title of 12(b) Security | Class A ordinary shares, par value | |
| Trading Symbol | SUGP | |
| Security Exchange Name | NASDAQ | |
| Entity Well-known Seasoned Issuer | No | |
| Entity Voluntary Filers | No | |
| Entity Current Reporting Status | Yes | |
| Entity Interactive Data Current | Yes | |
| Entity Filer Category | Non-accelerated Filer | |
| Entity Emerging Growth Company | true | |
| Elected Not To Use the Extended Transition Period | false | |
| Document Accounting Standard | U.S. GAAP | |
| Entity Shell Company | false | |
| Entity Common Stock, Shares Outstanding | 1,531,872 | |
| ICFR Auditor Attestation Flag | false | |
| Document Financial Statement Error Correction [Flag] | false | |
| Auditor Firm ID | 7254 | |
| Auditor Opinion [Text Block] | We have audited the accompanying consolidated balance sheets of SU Group Holdings Limited (the “Company”) as of September 30, 2024 and 2025, the related consolidated statements of operation, change in equity and cash flows for each of the two years in the period ended September 30, 2025, and the related notes(collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of September 30, 2024 and 2025, and the results of its operations and its cash flows for each of the two years in the period ended September 30, 2025, in conformity with accounting principles generally accepted in the United States of America. | |
| Auditor Name | Guangdong Prouden CPAs GP | |
| Auditor Location | Guangzhou, China | |
| Business Contact [Member] | ||
| Entity Addresses [Line Items] | ||
| Entity Address, Address Line One | 7th Floor, The Rays | |
| Entity Address, Address Line Two | No. 71 Hung To Road, Kwun Tong | |
| Entity Address, City or Town | Kowloon | |
| Entity Address, Country | HK | |
| Entity Address, Postal Zip Code | 000000 | |
| City Area Code | +852 | |
| Local Phone Number | 2341-8183 | |
| Contact Personnel Name | Chan Ming Dave |