Annual report pursuant to Section 13 and 15(d)

Cover

v3.21.1
Cover - USD ($)
 12 Months Ended
Mar. 31, 2021
May 21, 2021
Sep. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --03-31    
Document Period End Date Mar. 31, 2021    
Document Transition Report false    
Entity File Number 001-13449    
Entity Registrant Name QUANTUM CORP /DE/    
Entity Incorporation, State DE    
Entity Tax Identification Number 94-2665054    
Entity Address, Street 224 Airport Parkway    
Entity Address, Suite Suite 550    
Entity Address, City San Jose    
Entity Address, State CA    
Entity Address, Postal Zip Code 95110    
City Area Code (408)    
Local Phone Number 944-4000    
Title of each class Common Stock, $0.01 par value per share    
Trading Symbol QMCO    
Name of each exchange on which registered NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 88,226,482
Entity Common Stock, Shares Outstanding   57,086,961  
Documents Incorporated by Reference The portions of the registrant's proxy statement to be filed in connection with the Annual Meeting of Stockholders to be held in 2021 have been incorporated by reference into Part III of this Annual Report on Form 10-K.    
Entity Central Index Key 0000709283    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false