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Reportable Segments - Percentage of Revenues from Customers by Country (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 23, 2018	Jun. 24, 2018	Mar. 25, 2018	Dec. 24, 2017	Sep. 24, 2017	Jun. 30, 2019	Jun. 24, 2018	Jun. 25, 2017
Revenue from External Customer [Line Items]
Revenue	$ 251.2	$ 274.1	$ 280.5	$ 274.2	$ 265.8	$ 225.2	$ 223.2	$ 210.7	$ 1,080.0	$ 924.9	$ 771.5
United States
Revenue from External Customer [Line Items]
Revenue									261.4	220.2	200.8
China
Revenue from External Customer [Line Items]
Revenue									367.2	390.5	327.1
Europe
Revenue from External Customer [Line Items]
Revenue									255.0	167.4	119.6
Other
Revenue from External Customer [Line Items]
Revenue									$ 196.4	$ 146.8	$ 124.0
Geographic Concentration Risk | United States
Revenue from External Customer [Line Items]
% of Revenue									24.00%	24.00%	26.00%
Geographic Concentration Risk | China
Revenue from External Customer [Line Items]
% of Revenue									34.00%	42.00%	42.00%
Geographic Concentration Risk | Europe
Revenue from External Customer [Line Items]
% of Revenue									24.00%	18.00%	16.00%
Geographic Concentration Risk | Other
Revenue from External Customer [Line Items]
% of Revenue									18.00%	16.00%	16.00%

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- Definition

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