Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Mar. 31, 2020
Jun. 22, 2020
Sep. 30, 2019
Document and Entity Information [Abstract]      
Entity Registrant Name QUANTUM CORP /DE/    
Entity Central Index Key 0000709283    
Current Fiscal Year End Date --03-31    
Entity Filer Category Non-accelerated Filer    
Document Type 10-K    
Document Period End Date Mar. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   39,905,090  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 115,331,509