Operating Segments and Geographic Information - Revenue by Geographic Area (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 02, 2021 USD ($) region	Dec. 28, 2019 USD ($)	Jan. 02, 2021 USD ($) region	Dec. 28, 2019 USD ($)
Information on reportable segments
Number of geographic regions | region	3		3
Total net revenue	$ 299.9	$ 313.7	$ 584.6	$ 613.5
Product revenue
Information on reportable segments
Total net revenue	262.1	281.9	510.0	546.7
Service revenue
Information on reportable segments
Total net revenue	37.8	31.8	74.6	66.8
United States
Information on reportable segments
Total net revenue	88.6	96.2	166.4	181.2
United States | Product revenue
Information on reportable segments
Total net revenue	74.4	83.1	138.1	154.5
United States | Service revenue
Information on reportable segments
Total net revenue	14.2	13.1	28.3	26.7
Other Americas
Information on reportable segments
Total net revenue	19.8	20.6	37.4	41.3
Other Americas | Product revenue
Information on reportable segments
Total net revenue	16.0	17.2	30.3	33.8
Other Americas | Service revenue
Information on reportable segments
Total net revenue	3.8	3.4	7.1	7.5
Total Americas
Information on reportable segments
Total net revenue	108.4	116.8	203.8	222.5
Total Americas | Product revenue
Information on reportable segments
Total net revenue	90.4	100.3	168.4	188.3
Total Americas | Service revenue
Information on reportable segments
Total net revenue	18.0	16.5	35.4	34.2
Greater China
Information on reportable segments
Total net revenue	73.2	80.5	152.2	152.4
Greater China | Product revenue
Information on reportable segments
Total net revenue	69.9	78.4	147.2	148.9
Greater China | Service revenue
Information on reportable segments
Total net revenue	3.3	2.1	5.0	3.5
Other Asia-Pacific
Information on reportable segments
Total net revenue	23.2	32.5	52.4	67.8
Other Asia-Pacific | Product revenue
Information on reportable segments
Total net revenue	20.0	28.7	45.4	60.0
Other Asia-Pacific | Service revenue
Information on reportable segments
Total net revenue	3.2	3.8	7.0	7.8
Total Asia-Pacific
Information on reportable segments
Total net revenue	96.4	113.0	204.6	220.2
Total Asia-Pacific | Product revenue
Information on reportable segments
Total net revenue	89.9	107.1	192.6	208.9
Total Asia-Pacific | Service revenue
Information on reportable segments
Total net revenue	6.5	5.9	12.0	11.3
Switzerland
Information on reportable segments
Total net revenue	19.9	13.5	37.9	25.7
Switzerland | Product revenue
Information on reportable segments
Total net revenue	19.8	13.4	37.7	25.6
Switzerland | Service revenue
Information on reportable segments
Total net revenue	0.1	0.1	0.2	0.1
Other EMEA
Information on reportable segments
Total net revenue	75.2	70.4	138.3	145.1
Other EMEA | Product revenue
Information on reportable segments
Total net revenue	62.0	61.1	111.3	123.9
Other EMEA | Service revenue
Information on reportable segments
Total net revenue	13.2	9.3	27.0	21.2
Total EMEA
Information on reportable segments
Total net revenue	95.1	83.9	176.2	170.8
Total EMEA | Product revenue
Information on reportable segments
Total net revenue	81.8	74.5	149.0	149.5
Total EMEA | Service revenue
Information on reportable segments
Total net revenue	$ 13.3	$ 9.4	$ 27.2	$ 21.3