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Summary of Significant Accounting Policies and Concentrations of Risk (Concentrations) (Details) - Customer
12 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Apr. 02, 2016
Concentration Risk [Line Items]      
Percentage of total accounts receivable accounted from Avnet 60.00% 59.00%  
Percentage of net revenues through resale of product from Avnet 43.00% 44.00% 50.00%
Number of end customers accounted for net revenues 0 0 0
Percentage of mortgage-backed securities in total investment portfolio 24.00%    
Minimum [Member]      
Concentration Risk [Line Items]      
Percentage of higher grade securities investment in debt securities (more than) 91.00%    
Sales Revenue, Goods, Net [Member] | Support Products [Member] | Maximum [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 5.00%