Operating Segment And Geographic Information (Schedule Of Geographic Revenue Information Based On The Customer Location Within The Indicated Geographic Region) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 25, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 27, 2011	Dec. 26, 2010	Sep. 26, 2010	Jun. 27, 2010	Mar. 28, 2010	Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	$ 339.4	$ 403.2	$ 433.2	$ 413.0	$ 397.7	$ 414.4	$ 409.6	$ 378.0	$ 1,588.8	$ 1,599.7	$ 1,187.5
U.S. [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue									158.9	176.0	95.0
Other Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue									31.8	48.0	47.5
Europe [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue									206.5	224.0	142.5
China [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue									524.3	527.9	427.5
Taiwan [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue									222.4	223.9	190.0
Korea [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue									174.8	207.9	154.4
Other Asia/Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue									$ 270.1	$ 192.0	$ 130.6