Quarterly report pursuant to Section 13 or 15(d)

DOCUMENT AND ENTITY INFORMATION

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DOCUMENT AND ENTITY INFORMATION
In Millions, unless otherwise specified
9 Months Ended
Dec. 31, 2011
Feb. 03, 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   234.3
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2011  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2012