Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Mar. 31, 2019
Sep. 28, 2018
Document and Entity Information [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus FY  
Entity Registrant Name QUANTUM CORP /DE/  
Entity Central Index Key 0000709283  
Current Fiscal Year End Date --03-31  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status No  
Entity Shell Company false  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Trading Symbol QMCO  
Entity Common Stock, Shares Outstanding   35,551,570
Entity Public Float   $ 64,344,842
Entity Interactive Data Current No  
Title of 12(b) Security Common Stock  
Security Exchange Name NONE  
Entity Address, State or Province CA