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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 |

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