Operating Segments and Geographic Information - Revenue by Geographic Area (Details) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 28, 2019 USD ($) region	Dec. 29, 2018 USD ($)	Dec. 28, 2019 USD ($) region	Dec. 29, 2018 USD ($)
Information on reportable segments
Number of geographic regions \| region	3		3
Total net revenue	$ 313.7	$ 306.9	$ 613.5	$ 575.4
Product revenue
Information on reportable segments
Total net revenue	281.9	272.8	546.7	513.9
Service revenue
Information on reportable segments
Total net revenue	31.8	34.1	66.8	61.5
United States
Information on reportable segments
Total net revenue	96.2	104.1	181.2	176.9
United States \| Product revenue
Information on reportable segments
Total net revenue	83.1	89.8	154.5	149.9
United States \| Service revenue
Information on reportable segments
Total net revenue	13.1	14.3	26.7	27.0
Other Americas
Information on reportable segments
Total net revenue	20.6	21.3	41.3	42.3
Other Americas \| Product revenue
Information on reportable segments
Total net revenue	17.2	17.3	33.8	35.2
Other Americas \| Service revenue
Information on reportable segments
Total net revenue	3.4	4.0	7.5	7.1
Total Americas
Information on reportable segments
Total net revenue	116.8	125.4	222.5	219.2
Total Americas \| Product revenue
Information on reportable segments
Total net revenue	100.3	107.1	188.3	185.1
Total Americas \| Service revenue
Information on reportable segments
Total net revenue	16.5	18.3	34.2	34.1
Greater China
Information on reportable segments
Total net revenue	80.5	66.9	152.4	125.8
Greater China \| Product revenue
Information on reportable segments
Total net revenue	78.4	64.8	148.9	123.5
Greater China \| Service revenue
Information on reportable segments
Total net revenue	2.1	2.1	3.5	2.3
Other Asia-Pacific
Information on reportable segments
Total net revenue	32.5	34.0	67.8	73.5
Other Asia-Pacific \| Product revenue
Information on reportable segments
Total net revenue	28.7	30.4	60.0	66.4
Other Asia-Pacific \| Service revenue
Information on reportable segments
Total net revenue	3.8	3.6	7.8	7.1
Total Asia-Pacific
Information on reportable segments
Total net revenue	113.0	100.9	220.2	199.3
Total Asia-Pacific \| Product revenue
Information on reportable segments
Total net revenue	107.1	95.2	208.9	189.9
Total Asia-Pacific \| Service revenue
Information on reportable segments
Total net revenue	5.9	5.7	11.3	9.4
Switzerland
Information on reportable segments
Total net revenue	13.5	23.0	25.7	48.7
Switzerland \| Product revenue
Information on reportable segments
Total net revenue	13.4	23.0	25.6	48.7
Switzerland \| Service revenue
Information on reportable segments
Total net revenue	0.1	0.0	0.1	0.0
Other EMEA
Information on reportable segments
Total net revenue	70.4	57.6	145.1	108.2
Other EMEA \| Product revenue
Information on reportable segments
Total net revenue	61.1	47.5	123.9	90.2
Other EMEA \| Service revenue
Information on reportable segments
Total net revenue	9.3	10.1	21.2	18.0
Total EMEA
Information on reportable segments
Total net revenue	83.9	80.6	170.8	156.9
Total EMEA \| Product revenue
Information on reportable segments
Total net revenue	74.5	70.5	149.5	138.9
Total EMEA \| Service revenue
Information on reportable segments
Total net revenue	$ 9.4	$ 10.1	$ 21.3	$ 18.0