Restructuring And Impairments (Summary Of Restructuring And Impairment Cost) (Details) (USD $) In Millions	3 Months Ended
	Jun. 26, 2011	Mar. 27, 2011	Jun. 27, 2010	Jun. 26, 2011 Employee Separation Costs [Member] 2009 Infrastructure Realignment Program [Member]	Mar. 27, 2011 Employee Separation Costs [Member] 2009 Infrastructure Realignment Program [Member]	Jun. 26, 2011 Employee Separation Costs [Member] 2010 Infrastructure Realignment Program [Member]	Mar. 27, 2011 Employee Separation Costs [Member] 2010 Infrastructure Realignment Program [Member]	Jun. 26, 2011 Employee Separation Costs [Member] 2011 Infrastructure Realignment Program [Member]	Mar. 27, 2011 Employee Separation Costs [Member] 2011 Infrastructure Realignment Program [Member]	Jun. 26, 2011 Lease Impairment Costs [Member] 2008 Infrastructure Realignment Program [Member]	Mar. 27, 2011 Lease Impairment Costs [Member] 2008 Infrastructure Realignment Program [Member]	Jun. 26, 2011 Fab Closure Costs [Member] 2009 Infrastructure Realignment Program [Member]	Mar. 27, 2011 Fab Closure Costs [Member] 2009 Infrastructure Realignment Program [Member]	Jun. 27, 2010 2009 Infrastructure Realignment Program [Member]	Mar. 28, 2010 2009 Infrastructure Realignment Program [Member]
Accrual Balance, Beginning balance	$ 10.6	$ 11.0		$ 8.4	$ 8.1	$ 1.7	$ 2.2			$ 0.5	$ 0.7
New Charges	3.0	2.5		0.5	0.6	0.9	1.0	1.3	0.7			0.3	0.2
Cash Paid	(1.5)	(2.9)			(0.3)	(0.3)	(1.5)	(0.7)	(0.7)	(0.2)	(0.2)	(0.3)	(0.2)
Reserve Release	(0.1)		(2.4)	(0.1)										(0.2)	(0.2)
Non-Cash Items	0
Accrual Balance, Ending balance	$ 12.0	$ 10.6		$ 8.8	$ 8.4	$ 2.3	$ 1.7	$ 0.6		$ 0.3	$ 0.5