v3.20.1
Document and Entity Information - USD ($)
shares in Millions
 12 Months Ended
Feb. 01, 2020
Mar. 16, 2020
Aug. 02, 2019
Cover page.      
Document Type 10-K    
Entity Central Index Key 0001058057    
Current Fiscal Year End Date --02-01    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Annual Report true    
Document Period End Date Feb. 01, 2020    
Document Transition Report false    
Entity File Number 0-30877    
Entity Registrant Name Marvell Technology Group Ltd    
Entity Incorporation, State or Country Code D0    
Entity Tax Identification Number 77-0481679    
Entity Address, Address Line One Canon’s Court, 22 Victoria Street    
Entity Address, City or Town Hamilton    
Entity Address, Postal Zip Code HM 12    
Entity Address, Country BM    
City Area Code 441    
Local Phone Number 296-6395    
Title of 12(b) Security Common shares, $0.002 par value per share    
Trading Symbol MRVL    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 16,535,444,225
Entity Common Stock, Shares Outstanding   663.1  
Documents Incorporated by Reference Portions of Part III of this Form 10-K are incorporated by reference from the registrant’s definitive proxy statement for its 2020 annual general meeting of shareholders, which proxy statement will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this Form 10-K. Except with respect to information specifically incorporated by reference in this Form 10-K, the proxy statement is not deemed to be filed as part of this Form 10-K.