Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v2.4.1.9
Document and Entity Information
9 Months Ended
Dec. 31, 2014
Jan. 31, 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  
Trading Symbol QTM  
Document Type 10-Q  
Document Period End Date Dec. 31, 2014  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus (Q1,Q2,Q3,FY) Q3  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   256,388,447dei_EntityCommonStockSharesOutstanding