Commitments and Contingencies (Details) £ in Millions	3 Months Ended			9 Months Ended
	Mar. 30, 2019 USD ($)	Dec. 29, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 30, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 30, 2019 GBP (£)	Jun. 30, 2018 USD ($)	Jul. 02, 2016 GBP (£)	Jun. 30, 2016 GBP (£)
Loss Contingencies [Line Items]
Guarantee liabilities	$ 0			$ 0			$ 0
Charge to discontinued operations	0		$ 0	2,400,000	$ 0
Standby letters of credit	11,600,000			$ 11,600,000
Product Warranties
Warranty Term for most products				3 years
Changes in warranty reserve
Balance as of beginning of period	9,200,000		6,800,000	$ 8,200,000	5,800,000
Provision for warranty	1,700,000		800,000	3,100,000	3,000,000
Utilization of reserve	(1,700,000)		(600,000)	(4,400,000)	(4,100,000)
Adjustments related to pre-existing warranties (including changes in estimates)	(600,000)		200,000	1,700,000	2,200,000
Acquisition related	0		1,000,000	0	1,300,000
Balance as of end of period	8,600,000	$ 9,200,000	$ 8,200,000	8,600,000	$ 8,200,000
Performance bond
Loss Contingencies [Line Items]
Guarantee liabilities	1,500,000			1,500,000
Judicial ruling | Case related to amendment of pension for foreign subsidiary
Loss Contingencies [Line Items]
Loss contingency accrual	$ 7,700,000			$ 7,700,000		£ 5.9
Minimum | Judicial ruling | Case related to amendment of pension for foreign subsidiary
Loss Contingencies [Line Items]
Estimated liability | £									£ 5.7
Loss contingency accrual | £								£ 5.7
Maximum | Judicial ruling | Case related to amendment of pension for foreign subsidiary
Loss Contingencies [Line Items]
Estimated liability | £									£ 8.4
Spinoff | Lumentum
Loss Contingencies [Line Items]
Charge to discontinued operations		$ 2,400,000