Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Consolidated Statements Of Operations [Abstract]
Total revenue	$ 1,588.8	$ 1,599.7	$ 1,187.5
Cost of sales	1,029.6	1,036.7	897.2
Gross margin	559.2	563.0	290.3
Operating expenses:
Research and development	153.4	120.2	99.7
Selling, general and administrative	218.4	220.8	179.3
Amortization of acquisition-related intangibles	19.7	22.4	22.3
Restructuring and impairments	2.8	7.0	27.9
Charge for litigation		8.0	6.0
Total operating expenses	394.3	378.4	335.2
Operating income (loss)	164.9	184.6	(44.9)
Other expense, net	7.2	9.9	18.4
Income (loss) before income taxes	157.7	174.7	(63.3)
Provision (benefit) for income taxes	12.2	21.5	(3.1)
Net income (loss)	$ 145.5	$ 153.2	$ (60.2)
Net income (loss) per common share:
Basic	$ 1.15	$ 1.23	$ (0.49)
Diluted	$ 1.12	$ 1.20	$ (0.49)
Weighted average common shares:
Basic	126.7	124.6	123.8
Diluted	130.3	128.0	123.8