Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v3.4.0.3
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2016
May. 27, 2016
Sep. 30, 2015
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 Accelerated Filer    
Document Type 10-K    
Document Period End Date Mar. 31, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   266,278,126  
Trading Symbol QTM    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 121.4