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Concentration of Risk - Narrative (Details) - Customers
12 Months Ended
Jan. 29, 2017
Jan. 31, 2016
Jan. 25, 2015
Accounts receivable      
Minimum concentration risk threshold 10.00%    
Number of customers accounting for at least 10% of net receivables 0 0  
Net sales revenue      
Minimum concentration risk threshold 10.00%    
Two largest distributors in Asia | Net sales revenue      
Concentration risk, geographic For fiscal year 2016, our two largest distributors were based in Asia.    
Supplier concentration risk [Member] | Cost of silicon wafers [Member]      
Concentration risk, geographic A significant amount of the Company’s assembly and test operations are conducted by third-party contractors in China, Malaysia, Taiwan, Thailand, Korea and the Philippines.    
Third-party foundry in china | Cost of silicon wafers [Member]      
Concentration risk, percentage 25.00% 28.00% 37.00%
Authorized distributors [Member] | Net sales revenue      
Concentration risk, percentage 65.00%