Segment Information (Geographic Revenue) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Segment Reporting Information [Line Items]
Net revenue	$ 984.6	$ 900.8	$ 851.7	$ 914.3	$ 835.4	$ 751.7	$ 775.1	$ 926.8	$ 3,651.4	$ 3,289.0	$ 3,258.4
Total Americas [Member]
Segment Reporting Information [Line Items]
Net revenue									109.3	92.1	99.8
UNITED STATES
Segment Reporting Information [Line Items]
Net revenue									73.0	63.3	66.8
Other Americas [Member]
Segment Reporting Information [Line Items]
Net revenue									36.3	28.8	33.0
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net revenue									3,489.3	3,145.8	3,105.8
China
Segment Reporting Information [Line Items]
Net revenue									3,017.9	2,324.6	2,249.2
Taiwan
Segment Reporting Information [Line Items]
Net revenue									50.2	474.2	506.9
South Korea
Segment Reporting Information [Line Items]
Net revenue									133.7	94.8	100.0
Asia
Segment Reporting Information [Line Items]
Net revenue									287.5	252.2	249.7
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net revenue									$ 52.8	$ 51.1	$ 52.8