Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2012	Apr. 02, 2011	Apr. 03, 2010
Information on sale of available-for-sale securities
Gross realized gains on sale of available-for-sale securities	$ 2,916	$ 5,169	$ 2,947
Gross realized losses on sale of available-for-sale securities	(401)	(1,348)	(2,596)
Net realized gains on sale of available-for-sale securities	2,515	3,821	351
Amortization of premiums (discounts) on available-for-sale securities	$ 13,302	$ 7,650	$ (4,797)

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Name:	us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration