Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 972.0	$ 1,051.9
Customer Concentration Risk [Member] | Company A [Member]
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	58.00%	56.00%
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	$ 600.1	$ 626.8
CHINA
Disaggregation of Revenue [Line Items]
Revenues	194.5	199.6
KOREA, REPUBLIC OF
Disaggregation of Revenue [Line Items]
Revenues	99.1	118.3
TAIWAN, PROVINCE OF CHINA
Disaggregation of Revenue [Line Items]
Revenues	40.7	72.3
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenues	32.7	29.4
Asia, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 4.9	$ 5.5