v3.19.1
Document and Entity Information - shares
shares in Millions
3 Months Ended
May 04, 2019
May 30, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date May 04, 2019  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Trading Symbol MRVL  
Entity Registrant Name MARVELL TECHNOLOGY GROUP LTD  
Entity Central Index Key 0001058057  
Current Fiscal Year End Date --02-01  
Entity File Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Common Stock, Shares Outstanding   661.0