Summary of Significant Accounting Policies and Concentrations of Risk (Concentrations) (Details)	12 Months Ended
	Mar. 30, 2013 Customer	Mar. 31, 2012 Customer	Apr. 02, 2011 Customer
Concentration Risk [Line Items]
Percentage of total accounts receivable accounted from Avnet	64.00%	67.00%
Percentage of net revenues through resale of product from Avnet	46.00%	48.00%	51.00%
Number of end customers accounted for net revenues	0	0	0
Percentage of mortgage-backed securities in total investment portfolio	36.00%
Minimum [Member]
Concentration Risk [Line Items]
Percentage of higher grade securities investment in debt securities (more than)	87.00%
Sales Revenue, Goods, Net [Member] | Support Products [Member] | Maximum [Member]
Concentration Risk [Line Items]
Concentration risk, revenue (less than)	5.00%	5.00%	5.00%