Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended							12 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 26, 2011	Mar. 27, 2010	May 01, 2012 Principal Leased Facilities [Member] sqft	May 01, 2012 Headquarters And Engineering Facility [Member] sqft	May 01, 2012 Subleased Facility [Member] sqft	May 01, 2012 Failure Analysis Facility [Member] sqft	Mar. 31, 2012 New Corporate Headquarters [Member] sqft	Mar. 31, 2012 Tucson, Arizona Facility [Member] sqft	Mar. 31, 2012 Capacity Investment And Loading Agreement With STATS ChipPAC Ltd [Member]	Jan. 24, 2012 Capacity Investment And Loading Agreement With STATS ChipPAC Ltd [Member]	Dec. 22, 2011 Capacity Investment And Loading Agreement With STATS ChipPAC Ltd [Member]	Mar. 31, 2012 Foundry Commitments [Member]	Mar. 31, 2012 Assembly Purchase Order Commitments [Member]	Mar. 31, 2012 Outside Test Services Commitments [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Square footage of principal leased facilities				214,000	197,000	15,000	17,000	30,000	28,000
Expected lease term								5 years
Rent expense	$ 4.7	$ 4.6	$ 4.4
Sublease rental income	0.4	1.1	1.2
Non-cancelable purchase commitments												10.0	46.3	1.0	2.7
Purchase commitment, initial payment											5
Purchase commitment, remaining amount										5
Purchase commitment, rebate amount										10
Purchase commitment, expected rebate to receive										10
Other open purchase orders	$ 0.9