v3.8.0.1
Document and Entity Information - USD ($)
shares in Millions
12 Months Ended
Feb. 03, 2018
Mar. 22, 2018
Jul. 28, 2017
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Feb. 03, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Trading Symbol MRVL    
Entity Registrant Name MARVELL TECHNOLOGY GROUP LTD    
Entity Central Index Key 0001058057    
Current Fiscal Year End Date --02-03    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity File Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   496.5  
Entity Public Float     $ 5,333,299,261