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Document and Entity Information - shares
shares in Millions
 6 Months Ended
Sep. 30, 2024
Nov. 06, 2024
Cover [Abstract]    
Entity Registrant Name OLD MARKET CAPITAL CORPORATION  
Entity Central Index Key 0001000045  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --03-31  
Entity Filer Category Non-accelerated Filer  
Document Type 10-Q/A  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2024  
Amendment Flag true  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity File Number 0-26680  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 59-2506879  
Entity Address, Address Line One 1601 Dodge St.  
Entity Address, Address Line Two Suite 3350  
Entity Address, City or Town Omaha  
Entity Address, State or Province NE  
Entity Address, Postal Zip Code 68102  
City Area Code 727  
Local Phone Number 726-0763  
Title of 12(b) Security Common Stock  
Trading Symbol OMCC  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   6.7
Amendment Description The purpose of this Amendment No. 1 (this “Amendment”) to our Quarterly Report on Form 10-Q for the period ended September 30, 2024 (the “Form 10-Q”), as filed with the Securities and Exchange Commission (the “SEC”) on November 13, 2024, is solely to correct errors in the number of outstanding shares of the Registrant’s common stock on the cover page of the Form 10-Q and in the Condensed Consolidated Balance Sheets.This Amendment makes no other changes to the Form 10-Q as filed with the SEC on November 13, 2024 and no attempt has been made in this Amendment to modify or update the other disclosures presented in the Form 10-Q. This Amendment does not reflect subsequent events occurring after the original filing of the Form 10-Q (those events occurring after November 13, 2024) or modify or update in any way those disclosures that may be affected by subsequent events. Accordingly, this Amendment should be read in conjunction with the Form 10-Q and our other filings with the SEC.