v3.8.0.1
Income Taxes - Narrative (Details)
 1 Months Ended 12 Months Ended 24 Months Ended
Jun. 30, 2014
Jul. 31, 1999
Feb. 03, 2018
USD ($)
branch
Jan. 28, 2017
USD ($)
$ / shares
Jan. 30, 2016
USD ($)
$ / shares
Jan. 27, 2007
Feb. 03, 2018
USD ($)
branch
Apr. 29, 2017
USD ($)
Income Taxes [Line Items]                
Deferred tax assets for net operating losses available to be used     $ 8,600,000 $ 7,500,000     $ 8,600,000  
Deferred tax assets for U.S. federal and California research tax credits     607,726,000 450,503,000     607,726,000  
Valuation allowance     $ 618,353,000 $ 456,541,000     618,353,000  
Increase in valuation allowance             161,800,000  
Federal statutory tax rate     33.70% 35.00% 35.00%      
Unrecognized tax benefit that would affect the effective income tax rate if recognized     $ 22,100,000       22,100,000  
Unrecognized tax benefits offset by deferred tax assets     8,600,000 $ 7,500,000 $ 6,300,000      
Unrecognized tax benefit, interest and penalties accrued     17,200,000 21,600,000 26,400,000   17,200,000  
Interest and penalties related to unrecognized tax benefits included in consolidated statements of operation     2,300,000 $ 2,700,000 $ 4,600,000      
Uncertain tax positions decrease from the lapse of the statutes of limitation in various jurisdictions during the next 12 months     10,500,000       10,500,000  
Cash, cash equivalents and short-term investments     1,800,000,000       1,800,000,000  
Undistributed earnings of foreign subsidiaries     630,000,000       630,000,000  
Undistributed earnings of foreign earnings for which no deferred tax liability has been recognized     $ 430,000,000       $ 430,000,000  
Marvell Israel                
Income Taxes [Line Items]                
Number of branches entitled to tax programs | branch     2       2  
Foreign Subsidiaries                
Income Taxes [Line Items]                
Cash, cash equivalents and short-term investments     $ 1,100,000,000       $ 1,100,000,000  
Increase (decrease) in tax expense in the event of undistributed earnings needed by parent company or no longer considered indefinitely reinvested outside of Bermuda     $ 160,000,000          
Office of the Tax Commissioner, Bermuda                
Income Taxes [Line Items]                
Applicable statutory rate     0.00% 0.00% 0.00%   0.00%  
Economic Development Board of Singapore Pioneer Status                
Income Taxes [Line Items]                
Expiration of tax exemption, period 15 years 10 years            
Tax holidays, tax savings amount     $ 0 $ 900,000 $ 3,000,000      
Tax holidays, per share effect on earnings (less than) (in usd per share) | $ / shares       $ 0.01 $ 0.01      
Swiss Federal Department of Economy and the Vaud Cantonal Tax Administration Tax Holiday                
Income Taxes [Line Items]                
Expiration of tax exemption, period           10 years    
Tax holidays, tax savings amount     0 $ 0 $ 3,700,000      
Tax holidays, per share effect on earnings (less than) (in usd per share) | $ / shares         $ 0.01      
Foreign                
Income Taxes [Line Items]                
Net operating loss carryforwards     108,400,000       $ 108,400,000  
Federal                
Income Taxes [Line Items]                
Net operating loss carryforwards     1,200,000       1,200,000  
Federal | Research Tax Credit                
Income Taxes [Line Items]                
Tax credit carryforwards     286,400,000       286,400,000  
State | California                
Income Taxes [Line Items]                
Net operating loss carryforwards     5,700,000       5,700,000  
State | California | Research Tax Credit                
Income Taxes [Line Items]                
Tax credit carryforwards     298,300,000       298,300,000  
State | Other State | Research and Investment Tax Credit                
Income Taxes [Line Items]                
Tax credit carryforwards     $ 24,500,000       $ 24,500,000  
ASU 2016-09                
Income Taxes [Line Items]                
Deferred tax assets for U.S. federal and California research tax credits               $ 123,000,000