Summary of Significant Accounting Policies and Concentrations of Risk (Concentrations) (Details)	12 Months Ended
	Mar. 29, 2014 Customer	Mar. 30, 2013 Customer	Mar. 31, 2012 Customer
Concentration Risk [Line Items]
Percentage of total accounts receivable accounted from Avnet	55.00%	64.00%
Percentage of net revenues through resale of product from Avnet	46.00%	46.00%	48.00%
Number of end customers accounted for net revenues	0	0	0
Percent of Worldwide Net revenues Accounted From End Customer	10.00%	10.00%	10.00%
Percentage of mortgage-backed securities in total investment portfolio	34.00%
Minimum [Member]
Concentration Risk [Line Items]
Percentage of higher grade securities investment in debt securities (more than)	84.00%
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%
Auction Rate Securities [Member] | Minimum [Member]
Concentration Risk [Line Items]
Student Loan Auction Rate Securities Maturity Date	June 2043
Auction Rate Securities [Member] | Maximum [Member]
Concentration Risk [Line Items]
Student Loan Auction Rate Securities Maturity Date	May 2047