Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 29, 2013	Mar. 30, 2012	Mar. 29, 2013	Mar. 30, 2012
Net revenue	$ 425.2	$ 364.7	$ 878.9	$ 758.4
Cost of goods sold	248.5	212.4	509.6	434.3
Gross profit	176.7	152.3	369.3	324.1
Operating expenses:
Research and development	56.3	53.0	114.4	99.9
Selling, general and administrative	39.7	40.2	77.8	83.2
Amortization of intangibles	7.2	9.3	15.4	15.6
Restructuring and other charges	4.8	6.0	6.4	6.6
Total operating expenses	108.0	108.5	214.0	205.3
Operating income	68.7	43.8	155.3	118.8
Interest expense	0	(0.1)	0	(0.6)
Other expense, net	(1.4)	(0.3)	(1.1)	(0.1)
Income before income taxes	67.3	43.4	154.2	118.1
Provision for income taxes	5.6	9.4	26.0	26.9
Net income	$ 61.7	$ 34.0	$ 128.2	$ 91.2
Earnings per share:
Basic (in dollars per share)	$ 0.33	$ 0.18	$ 0.68	$ 0.49
Diluted (in dollars per share)	$ 0.32	$ 0.18	$ 0.66	$ 0.48
Weighted average shares:
Basic (in shares)	188.7	185.2	189.1	184.6
Diluted (in shares)	193.1	191.0	193.6	190.3