Annual report pursuant to Section 13 and 15(d)

DOCUMENT AND ENTITY INFORMATION

v2.4.0.6
DOCUMENT AND ENTITY INFORMATION (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2013
May 31, 2013
Sep. 30, 2012
Entity Registrant Name QUANTUM CORP /DE/    
Entity Central Index Key 0000709283    
Current Fiscal Year End Date --03-31    
Entity Filer Category Accelerated Filer    
Trading Symbol qtm    
Entity Common Stock, Shares Outstanding   243,297,051  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Mar. 31, 2013    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2013    
Entity Well-Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 225.3