Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2024
Jun. 05, 2024
Sep. 30, 2023
Document Information [Line Items]      
Document Type 10-K/A    
Amendment Flag true    
Document Period End Date Mar. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol GHM    
Entity Registrant Name GRAHAM CORPORATION    
Entity Central Index Key 0000716314    
Current Fiscal Year End Date --03-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Document Financial Statement Error Correction [Flag] false    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Small Business true    
Title of 12(b) Security Common Stock, Par Value $0.10 Per Share    
Security Exchange Name NYSE    
Entity File Number 001-08462    
Entity Tax Identification Number 16-1194720    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 20 Florence Avenue    
Entity Address, City or Town Batavia    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 14020    
City Area Code 585    
Local Phone Number 343-2216    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Document Annual Report true    
Document Transition Report false    
Entity Common Stock, Shares Outstanding   10,870,564  
Entity Public Float     $ 168.0
Auditor Name DELOITTE & TOUCHE LLP    
Auditor Location Rochester, New York    
Auditor Firm ID 34    
Amendment Description Graham Corporation (the “Company”) is filing this Amendment No.1 on Form 10-K/A to its Annual Report on Form 10-K for the fiscal year ended March 31, 2024 (the “Original Filing”), which was filed with the Securities and Exchange Commission (“SEC”) on June 7, 2024, solely for the purpose of adding the conformed signature of Deloitte & Touche LLP to the Report of Independent Registered Public Accounting Firm included in Item 8 and Part 9A of Part II of the Original Filing (the “Audit Reports”). The signed Audit Reports were received by the Company prior to the Original Filing being filed with the SEC, but the conformed signature in the Audit Reports was inadvertently omitted from the Original Filing. Pursuant to Rule 12b-15 of the Securities Exchange Act of 1934, as amended, this Amendment No. 1 contains the complete text of Item 15. Exhibits, Financial Statement Schedules and certifications of the Company’s Principal Executive Officer and Principal Financial Officer required under Items 302 and 906 of the Sarbanes-Oxley Act of 2002, as amended, dated as of the date of this Amendment. Except as expressly set forth in this Amendment No. 1, no other changes have been made to the Original Filing, and this Form 10-K/A does not modify, amend or update in any way any of the financial or other information contained in the Original Filing. This Form 10-K/A does not reflect events that may have occurred subsequent to the filing date of the Original Filing.