Summary of Significant Accounting Policies and Concentrations of Risk (Details Textual) (USD $)	12 Months Ended
	Mar. 31, 2012 Customer	Apr. 02, 2011 Customer	Apr. 03, 2010 Customer	Mar. 28, 2009
Summary of Significant Accounting Policies and Concentrations of Risk (Textual) [Abstract]
Original maturity period of liquid investments	three months or less
Minimum maturity period of short-term investments	greater than three months
Maximum maturity period of short-term investments	less than one year
Maturity period of long-term investments	greater than one year
Long term investment	$ 28,900,000	$ 35,000,000
Number of investments held-to-maturity	0	0
Depreciation expense	55,658,000	50,361,000	50,180,000
Impairment of goodwill	0
Percentage of net revenues from products sold to distributors	61.00%
Deferred revenue	90,000,000	134,000,000
Net deferred cost of revenues	23,000,000	34,200,000
Deferred income on shipments to distributors	67,002,000	99,763,000
Revenue from sale of software and services	less than 6%
Percentage of total accounts receivable accounted from Avnet	67.00%	79.00%
Percentage of net revenues through resale of product from Avnet	48.00%	51.00%	49.00%
Percentage of net revenues from end customer	10.00%	10.00%	10.00%
Number of end customers accounted for net revenues	0	0	0
Percentage of higher grade securities investment in debt securities	90.00%
Percentage of investments in debt securities, domestic issuers	72.00%
Percentage of investments in debt securities, foreign issuers	28.00%
Total investment portfolio	3,060,000,000
Percentage of student loan auction rate securities in total investment portfolio	1.00%
Investments downgraded to an A rate securities				$ 3,400,000
Percentage of mortgage-backed securities in total investment portfolio	29.00%
Maximum [Member]
Property, Plant and Equipment [Line Items]
Student loan auction rate securities maturity date	May 2046
Maximum [Member] | Building [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	30 year
Maximum [Member] | Machinery Equipment Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	5 year
Minimum [Member]
Property, Plant and Equipment [Line Items]
Student loan auction rate securities maturity date	December 2027
Minimum [Member] | Building [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	15 year
Minimum [Member] | Machinery Equipment Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	3 year