Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Mar. 29, 2019	Mar. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 810.4	$ 913.4	$ 1,782.4	$ 1,965.3
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	403.1	419.9	1,003.2	1,046.7
CHINA
Disaggregation of Revenue [Line Items]
Revenues	199.4	242.0	394.0	441.7
KOREA, REPUBLIC OF
Disaggregation of Revenue [Line Items]
Revenues	106.0	118.6	205.0	236.8
TAIWAN, PROVINCE OF CHINA
Disaggregation of Revenue [Line Items]
Revenues	64.1	89.4	104.8	161.6
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenues	31.1	37.8	63.8	67.3
Asia, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 6.7	$ 5.7	$ 11.6	$ 11.2