Quarterly report [Sections 13 or 15(d)]

Cover Page

v3.25.3
Cover Page - shares
6 Months Ended
Sep. 30, 2025
Nov. 11, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Transition Report false  
Entity File Number 001-13449  
Entity Registrant Name QUANTUM CORP /DE/  
Entity Incorporation, State DE  
Entity Tax Identification Number 94-2665054  
Entity Address, Street Address 10770 E. Briarwood Avenue  
Entity Address, City Centennial  
Entity Address, State CO  
Entity Address, Postal Zip Code 80112  
City Area Code (408)  
Local Phone Number 944-4000  
Title of each class Common Stock, $0.01 par value per share  
Trading Symbol QMCO  
Name of each exchange on which registered NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   13,721,291
Entity Central Index Key 0000709283  
Current Fiscal Year End Date --03-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false