Operating Segments and Geographic Information - Revenue by geographic area (Details) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 30, 2019 USD ($) region	Mar. 31, 2018 USD ($)	Mar. 30, 2019 USD ($) region	Mar. 31, 2018 USD ($)
Information on reportable segments
Number of geographic regions | region	3		3
Total net revenue	$ 265.2	$ 218.7	$ 840.6	$ 615.0
Product revenue
Information on reportable segments
Total net revenue	232.1	193.2	746.0	539.6
Service revenue
Information on reportable segments
Total net revenue	33.1	25.5	94.6	75.4
United States
Information on reportable segments
Total net revenue	77.1	78.9	254.0	246.8
United States | Product revenue
Information on reportable segments
Total net revenue	63.4	66.8	213.3	207.9
United States | Service revenue
Information on reportable segments
Total net revenue	13.7	12.1	40.7	38.9
Other Americas
Information on reportable segments
Total net revenue	18.1	16.9	60.4	57.6
Other Americas | Product revenue
Information on reportable segments
Total net revenue	14.4	13.9	49.6	46.0
Other Americas | Service revenue
Information on reportable segments
Total net revenue	3.7	3.0	10.8	11.6
Total Americas
Information on reportable segments
Total net revenue	95.2	95.8	314.4	304.4
Total Americas | Product revenue
Information on reportable segments
Total net revenue	77.8	80.7	262.9	253.9
Total Americas | Service revenue
Information on reportable segments
Total net revenue	17.4	15.1	51.5	50.5
Greater China
Information on reportable segments
Total net revenue	39.4	38.2	165.2	90.3
Greater China | Product revenue
Information on reportable segments
Total net revenue	36.5	37.7	160.0	88.8
Greater China | Service revenue
Information on reportable segments
Total net revenue	2.9	0.5	5.2	1.5
Other Asia
Information on reportable segments
Total net revenue	43.9	25.3	117.4	56.3
Other Asia | Product revenue
Information on reportable segments
Total net revenue	41.0	22.6	107.4	51.6
Other Asia | Service revenue
Information on reportable segments
Total net revenue	2.9	2.7	10.0	4.7
Total Asia-Pacific
Information on reportable segments
Total net revenue	83.3	63.5	282.6	146.6
Total Asia-Pacific | Product revenue
Information on reportable segments
Total net revenue	77.5	60.3	267.4	140.4
Total Asia-Pacific | Service revenue
Information on reportable segments
Total net revenue	5.8	3.2	15.2	6.2
Switzerland
Information on reportable segments
Total net revenue	23.9	15.9	72.6	56.4
Switzerland | Product revenue
Information on reportable segments
Total net revenue	23.9	15.9	72.6	56.4
Switzerland | Service revenue
Information on reportable segments
Total net revenue	0.0	0.0	0.0	0.0
Other EMEA
Information on reportable segments
Total net revenue	62.8	43.5	171.0	107.6
Other EMEA | Product revenue
Information on reportable segments
Total net revenue	52.9	36.3	143.1	88.9
Other EMEA | Service revenue
Information on reportable segments
Total net revenue	9.9	7.2	27.9	18.7
Total EMEA
Information on reportable segments
Total net revenue	86.7	59.4	243.6	164.0
Total EMEA | Product revenue
Information on reportable segments
Total net revenue	76.8	52.2	215.7	145.3
Total EMEA | Service revenue
Information on reportable segments
Total net revenue	$ 9.9	$ 7.2	$ 27.9	$ 18.7