Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 767.0	$ 894.3	$ 2,549.4	$ 2,859.6
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	355.7	390.2	1,358.9	1,436.9
CHINA
Disaggregation of Revenue [Line Items]
Revenues	212.9	272.6	606.8	714.3
KOREA, REPUBLIC OF
Disaggregation of Revenue [Line Items]
Revenues	76.9	94.2	282.0	331.0
TAIWAN, PROVINCE OF CHINA
Disaggregation of Revenue [Line Items]
Revenues	78.0	90.9	182.8	252.5
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenues	36.4	40.7	100.2	108.0
Asia, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 7.0	$ 5.7	$ 18.7	$ 16.9