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RELATED-PARTY TRANSACTIONS Equity Method Investment-(Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2013	Jun. 29, 2018 USD ($) member	Jun. 30, 2017 USD ($)	Jun. 29, 2018 USD ($) member	Jun. 30, 2017 USD ($)	Sep. 28, 2018 USD ($)	Sep. 29, 2017 USD ($)
Related Party Transaction [Line Items]
Income (loss) from equity method investments				$ 3.2	$ 3.0
Investments in privately-held companies		$ 52.6		52.6			$ 52.3
Varian
Related Party Transaction [Line Items]
Purchases from related party		$ 1.0	$ 0.5	$ 2.5	1.4
dpiX Holding | Varian
Related Party Transaction [Line Items]
Equity method investment, ownership percentage		40.00%		40.00%
Number of consortium members | member		4		4
Income (loss) from equity method investments		$ 0.9	2.3	$ 3.9	2.9
Equity method investments		49.6		49.6			50.0
Purchases from related party		5.6	$ 5.3	17.6	$ 10.9
Accounts payable, related parties		$ 3.9		3.9			$ 3.4
Percentage of manufacturing capacity	50.00%
Percentage of fixed costs	50.00%
Fixed Cost Commitments | dpiX Holding | Varian
Related Party Transaction [Line Items]
Purchases from related party				$ 8.2
Scenario, Forecast | Fixed Cost Commitments | dpiX Holding | Varian
Related Party Transaction [Line Items]
Purchases from related party						$ 16.3

X

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Amount for accounts payable to related parties.

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