Segment Information (Geographic Revenue) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 03, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 28, 2012	Oct. 03, 2014	Sep. 27, 2013	Sep. 28, 2012
Segment Reporting Information [Line Items]
Net revenue	$ 718.2	$ 587.0	$ 481.0	$ 505.2	$ 477.0	$ 436.1	$ 425.2	$ 453.7	$ 2,291.5	$ 1,792.0	$ 1,568.6
Total Americas [Member]
Segment Reporting Information [Line Items]
Net revenue									73.0	77.5	88.7
UNITED STATES
Segment Reporting Information [Line Items]
Net revenue									47.5	67.3	70.3
Other Americas [Member]
Segment Reporting Information [Line Items]
Net revenue									25.5	10.2	18.4
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net revenue									2,170.9	1,671.7	1,442.4
China
Segment Reporting Information [Line Items]
Net revenue									1,574.4	979.3	820.1
Taiwan
Segment Reporting Information [Line Items]
Net revenue									322.2	387.5	311.7
South Korea
Segment Reporting Information [Line Items]
Net revenue									107.4	102.9	103.2
Asia
Segment Reporting Information [Line Items]
Net revenue									166.9	202.0	207.4
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net revenue									$ 47.6	$ 42.8	$ 37.5