Significant Customers and Concentrations of Credit Risk (Details)	3 Months Ended		6 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Mar. 31, 2012
Significant Customers and Concentrations of Credit Risk (Textual) [Abstract]
Percentage of total accounts receivable accounted from Avnet	64.00%		64.00%		67.00%
Percentage of net revenues through resale of product from Avnet	44.00%	47.00%	45.00%	48.00%
Number of end customers accounted for net revenues	1	1	0	1
Percentage of net revenues from end customer	11.00%	14.00%	10.00%	11.00%
Percentage of higher grade securities investment in debt securities			89.00%
Percentage of mortgage-backed securities in total investment portfolio	35.00%		35.00%