Significant Customers and Concentrations of Credit Risk (Details)	3 Months Ended
	Jun. 30, 2012 Customer	Jul. 02, 2011 Customer	Mar. 31, 2012
Significant Customers and Concentrations of Credit Risk (Textual) [Abstract]
Percentage of total accounts receivable accounted from Avnet	59.00%		67.00%
Percentage of net revenues through resale of product from Avnet	46.00%	49.00%
Number of end customers accounted for net revenues	0	0
Percentage of net revenues from end customer	10.00%	10.00%
Percentage of higher grade securities investment in debt securities	88.00%
Percentage of mortgage-backed securities in total investment portfolio	33.00%