Quarterly report pursuant to Section 13 or 15(d)

Cover Page

v3.20.2
Cover Page - shares
 3 Months Ended
Jun. 30, 2020
Jul. 31, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2020  
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 224 Airport Parkway  
Entity Address, Suite Suite 550  
Entity Address, City San Jose  
Entity Address, State CA  
Entity Address, Postal Zip Code 95110  
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 Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   39,907,956
Entity Central Index Key 0000709283  
Current Fiscal Year End Date --03-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q1  
Amendment Flag false